After each reading of an oxygen indicator, the instrument should be purged with ______.A.CO2B.fresh airC.the tested compartment’s airD.Water
After each reading of an oxygen indicator, the instrument should be purged with ______.
A.CO2
B.fresh air
C.the tested compartment’s air
D.Water
相关考题：
Part BDirections:Write an essay with the title “Reading Books in Printed Form. or on Computer” in which you should1） analyze the strong points and weak points of each one, and2） tell your own preference and your reasons.You should write 160—200 words neatly on ANSWER SHEET 2.(20 points)
听力原文：M: If an instrument is payable to the order of both A and B who are not partners, what should they do?W: Both of them must endorse, unless one has authority to endorse for the other.Q: Which of the following is not right according to the woman?(18)A．Both endorse the instrument.B．Neither of them endorses the instrument.C．A authorizes B to endorse the instrument.D．B authorizes A to endorse the instrument.
Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.A.Orsat apparatusB.flame safety lampC.Halide torchD.combustible gas indicator
What is the best instrument for establishing a safe working area before welding in a confined space?A.An oxygen indicatorB.A combustible gas indicatorC.A combination combustible gas and oxygen indicatorD.A flame safety lamp
While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then ______.A.enter the tank safelyB.suspect the accuracy of the readingC.ventilate the tankD.test for nitrogen
If the meter needle of the oxygen indicator cannot be set to zero，what should be done ________．A.Replace the batteriesB.Check the sampling tube for blockageC.Adjust the final reading by the amount the needle is displaced from zeroD.Replace the platinum filament
What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．A.Exposure to carbon dioxide for no more than 1 minuteB.Exposure to carbon dioxide for more than 10 minutesC.Exposure to a very low concentration of sulfur dioxide for no more than 2 minutesD.None of the above
An oxygen indicator can be used to determine if there is ______.A.sufficient oxygen in a compartment to support lifeB.combustible gases presentC.hyfrogen gases presentD.All of the above
Deficient oxygen content inside a chain locker can be detected with ______.A.litmus paperB.a combustible gas indicatorC.an oxygen breathing apparatusD.an oxygen indicator
根据下面资料，回答Reading aloud and silent reading are two different types of reading practice. Each has a function in the teaching of reading and should not be 16 by the other. However, we need to be aware when we should use them. When we 17 teaching reading or developing reading skills, we are mostly referring to silent reading. To develop 18 readers in a foreign language, silent reading activities must be given enough 19 and time in class with the proper guidance from the 20 . Reading aloud also has its particular 21 for our students who are learning English as a foreign language. 22 can help them acquire good pronunciation and intonation, 23 them with new words and the stress patterns of English, help 24 their eontidenee in speaking the language. Therefore, opportunities should be 25 for students to read aloud only after they have comprehended the text 26 before comprehension can be very 27 and it can easily destroy their self-confidence. With 28 reading, it sets up a poor reading model for other students as well. It is 29 that we first help students learn the text through 30 reading activities and then with comprehension we give our students practice by using an audio tape to 31 a good model for practicing reading aloud. With adequate 32 , we may ask the students to read aloud to the whole class to 33 their motivation and confidence. By asking the students to read aloud, it is also a good chance for the teacher to get 34 on the students′ comprehension as we can notice 35 there are wrong pauses or mispronounced words which indicate possible difficulties or misunderstanding of the text. 第（17）题选A.work outB.run intoC.talk aboutD.take on
根据下面资料，回答Reading aloud and silent reading are two different types of reading practice. Each has a function in the teaching of reading and should not be 16 by the other. However, we need to be aware when we should use them. When we 17 teaching reading or developing reading skills, we are mostly referring to silent reading. To develop 18 readers in a foreign language, silent reading activities must be given enough 19 and time in class with the proper guidance from the 20 . Reading aloud also has its particular 21 for our students who are learning English as a foreign language. 22 can help them acquire good pronunciation and intonation, 23 them with new words and the stress patterns of English, help 24 their eontidenee in speaking the language. Therefore, opportunities should be 25 for students to read aloud only after they have comprehended the text 26 before comprehension can be very 27 and it can easily destroy their self-confidence. With 28 reading, it sets up a poor reading model for other students as well. It is 29 that we first help students learn the text through 30 reading activities and then with comprehension we give our students practice by using an audio tape to 31 a good model for practicing reading aloud. With adequate 32 , we may ask the students to read aloud to the whole class to 33 their motivation and confidence. By asking the students to read aloud, it is also a good chance for the teacher to get 34 on the students′ comprehension as we can notice 35 there are wrong pauses or mispronounced words which indicate possible difficulties or misunderstanding of the text. 第（34）题选A.suggestionB.feedbackC.promotionD.inspiration
You need to meet the fraud detection requirements. What should you do?（）A、Use Percentage Sampling in SSIS.B、Use a Neural Network Data mining algorithm.C、Create an SSAS Key Performance Indicator for each account.D、Monitor transactions by using SQL Server Profiler.
单选题The actual rudder angle reading is（）Athe rudder angle indicator readingBthe desired rudder angle readingCthe measured rudder angle readingDthe intended rudder angle reading
单选题If the meter needle of the oxygen indicator cannot be set to zero，what should be done? （）AReplace the batteriesBCheck the sampling tube for blockageCAdjust the final reading by the amount the needle is displaced from zeroDReplace the platinum filament
单选题When you are reading a novel, you should check your understanding of the content after ______.Aevery chapterBevery sectionCevery four or five pagesDevery ten or twelve pages
单选题A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases? （）AIn the lower level of the pumproomBIn the middle level of the pumproomCIn the upper level of the pumproomDOn the deck outside the pumproom
单选题Deficient oxygen content inside a chain locker can be detected with（）.Alitmus paperBa combustible gas indicatorCan oxygen breathing apparatusDan oxygen indicator
单选题Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an（）.AOrsat apparatusBflame safety lampCHalide torchDcombustible gas indicator
单选题You have configured the system to purge mailboxes after 8 days of being deleted. You need to receive a notification when the mailboxes are purged. What should you do？（）AStart a data collectorBStart an event viewer subscriptionCAdd a task to the application event logDModify the properties of the mailbox database
单选题A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.ApurifiesBcombinationsCconcentrationsDfilters
单选题Which of the listed pre-start procedures should be carried out prior to starting a crosshead type diesel engine after an overhaul?（）APre-lube cylinders with hand cranksBOpen all air space drain cocksCOpen all indicator valvesDAll of the above
单选题An oxygen indicator will detect （）.Athe amount of oxygen in a spaceBthe presence of harmful amounts of carbon monoxideCconcentrations of explosive gasDAll of the above
单选题About principles of teaching reading, which description is wrong?AThe selected texts and attached tasks should be accessible to the students.BTasks should be given after reading.CTasks should help develop students' reading skills rather than test their reading compre-hension.DThe teacher should provide enough guidance and assistance at the beginning.
单选题About principles of teaching reading, which description is wrong?AThe selected texts and attached tasks should be accessible to the students.BTasks should be given after reading.CTasks should help develop students' reading skills rather than test their reading comprehension.DThe teacher should provide enough guidance and assistance at the beginning.
单选题After each reading of an oxygen indicator，the instrument should be purged with（）.ACO2Bfresh airCthe tested compartment's airDwater
单选题While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then （）.Aenter the tank safelyBsuspect the accuracy of the readingCventilate the tankDtest for nitrogen
单选题Deficient oxygen content inside a chain locker can be detected with（）.Alitmus paperBcombustible gas indicatorCoxygen breathing apparatusDoxygen indicator