单选题You must take good care of the drainage cock of the air control systemBecause （） leads scale formed which might malfunction the pilot control valve and other instruments.Athe temperatureBthe rustCthe pressureDthe humidity
单选题
You must take good care of the drainage cock of the air control systemBecause （） leads scale formed which might malfunction the pilot control valve and other instruments.
A
the temperature
B
the rust
C
the pressure
D
the humidity
参考解析
解析：
暂无解析
相关考题：
7．_________ the young trees is our duty．A． Take good careB． Taking good care ofC． Taking good careD． Take good care of
—May I open the window to let in some fresh air ?—___________A. Come on B. Take care C. Go ahead! D. Hold on!
（B）The surprising experiment I am about to describe proves that air is all around you and that it proves down upon you. Air pressure is a wonderful force. When you swim underwater, you can feel water push down your body. The air all around you does the same. However, your body is so used to it that you do not notice this. The pressure is caused by a layer of air called the atmosphere. This layer surrounds the Earth, extending to about five kilometers above the Earth’s surface.The following experiment is an easy one that you can do at home. But make sure that you are supervised, because you will need to use matches. Now foe the experiment！What you need?A hard-boiled egg without the shell?A bottle with a neck slightly smaller than the egg?A piece of paper?A matchMetheod1） Check that the paper will sit firmly on the neck of the bottle.2） Tear the paper into strips and put the strips into the bottle.3） Light the paper by dropping a burning match into the bottle.4） Quickly sit the egg on the neck of the bottle.ResultAstonishingly, the egg will be sucked into the bottle. Your friends will be amazed when you show them the experiment. But be careful when you handle matches.Why it happenedAs the paper burns, it needs oxygen and uses up the oxygen （air） in the bottle. The egg acts as a seal in the neck of the bottle, so no more air can get inside. This reduces the air pressure inside the bottle. The air pressure must equalize, so more air from outside must enter the bottle. The outside air pressure against the egg and then the egg is pushed into the bottle! The proves that air is all around and that it is pressing down on it.60. Why is there the need to take care when you are doing the experiment?A. The bottle could break.B. You need to light the paper with a match.C. The egg needs to be shelled.D. The egg has to be perfectly placed on the neck of the bottle.
You must follow the directions exactly and if you become _____, you must take the time to go back again and reread them.A. to confuseB. confusingC. confuseD. confused
To be a good teacher, you need some of the gifts of a good actor; you must be able to hold the attention and interest of your students; you must be a clear speaker, with a good, strong, pleasing voice which is fully under you control; and you must be able to act what you are teaching, in order to make its meaning clear. Watch a good teacher, and you will see that he does not move motionless before his class; he stands the whole time he is teaching; he walks about, using his arms, hands and fingers to help him in his explanation, and his face to express his feeling. Listen to him, and you will hear the loudness, the quality and musical note of his voice always changing according to what he is talking about. The fact that a good teacher has some of the gifts of a good actor doesn't mean he will indeed be able to act well on the stage, for there are very important differences between the teacher's word and the actor's. The actor has to speak words which has been learnt by heart, he has1、A good teacher ______.A、knows how to hold the interest of his studentsB、must have a good voiceC、knows how to act on the stageD、stands or sits motionless while teaching2、In what way is a teacher''s work different from an actor''s? ( )A、The teacher must learn everything by heart.B、He knows how to control his voice better than an actor.C、he has to deal with unexpected situations.D、 He has to use more facial expressions.3、The main difference between students in class and theatre audience is that ( ).A、students can move around in the classroomB、students must keep silent while theatre audienceC、no memory work is needed for the studentsD、the students must take part in their teachers' plays
it's getting late. I'd better be going now._____ A)take it easyB)good nightC)must you go so soonD)oh,I understand
You should take care that you have not ________ any detail in the design.A：disappearedB：thrownC：deliveredD：neglected
Your pictures are so good. You should () painting as a career. A、take awayB、take upC、take offD、take out
You must take good care of the drainage cock of the air control system. Because lead scale formed which might malfunctions the pilot control valve and other instruments.A.the temperatureB.the rustC.the pressureD.the humidity
Even if you don’t actually carry out all the actions you say you will take, honest students will appreciate knowing that you care enough about academic ______ to take precautions.A.entiretyB.integrityC.unityD.reliability
Must I take a taxi? No, you（）. You can take my car.A、had better toB、don'tC、must notD、don't have to
If you make different trade in different countries, you must take different transport modes? （）A、YesB、NotC、It must be based on costD、Not mention in the paragraph
You work as the enterprise exchange administrator at Xxx .The Xxx network consists of a domain named xxx .What actions must you take to allow a room mailbox to automatically take requests for meetings？（）A、You must use log transactions.B、You must use Calendar Repair Assistant （CRA）.C、You must select the resource booking attendant.D、You must set up Task Scheduler.
单选题Take care when you are driving, ______ in a summer storm like this.AimmediatelyBespeciallyCprobablyDrecently
单选题As the population increases and human needs expand, we must take care not to _____ all of our natural resources at once.AeraseBminimizeCmaximizeDexhaust
单选题Must I take a taxi? No, you（）. You can take my car.Ahad better toBdon'tCmust notDdon't have to
单选题Jane:Oh, that was a delicious meal! Bill:What would you like for dessert? Jane:Nothing, thank you. Bill: Are you sure you don’t want any? Jane:Yes, I’m sure._____ Bill: You look fine to me.AI must take care of my teeth.BBut I don’t mind some ice-cream.CI’m too full to eat anything more.DI must watch my figure, you know.
单选题Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.Acheck and regulate the water levelBclose the air cock once fires are litCblowdown the gage glassDcrack the steam stop to assure protective steam flow