40．A．at leastB．at allC．at onceD．at first
40．
A．at least
B．at all
C．at once
D．at first
相关考题：
●Suppose we have the relation schema R(A，B，C，D)with functional dependencies；F{A→B，B→C，C→D，D→A}，then R(A，B，C，D．at least is in (73) ．(73) A．1NFB．2NFC．3NFD．BCNF
关于抗凝血酶(AT)的临床意义,正确的是A.AT活性增高为异常,活性减低无临床意义B.AT活性减低为异常,增高无临床意义C.AT活性增高或减低,均可导致出血D.AT活性增高可导致出血,减低导致血栓形成E.AT活性减低可导致出血,增高可导致血栓形成
We now know that about ____ of all the kinds of seaweed are animals.A: one fourB: once fourC: once fourthD: one fourth
___ I’d like to welcome you to the conference.A、All firstB、First of allC、Of all the firstD、All of the first
The Oracle Database 11g database is running in the ARCHIVELOG mode. The archived redo log files are stored on three locations. The Flash Recovery Area is one of the locations. The details are given below:Which statement is true regarding what this command accomplishes?（）A. All archived redo log files backed up at least twice to tape are deleted.B. All archived redo log files backed up at least once to tape are eligible for deletion.C. All archived redo log files backed up at least twice to tape are deleted from the flash recovery area.D. All archived redo log files in local archiving destinations and the flash recovery area backed up at least twice to tape are eligible for deletion.
is NOT a concept of White Box Testing.A．You should execute all logical decisions on their tree and false sides.B．You should execute all independent paths within a module at least once.C．You should execute all loops at their boundary conditions.D．You should execute all interfaces at their boundary conditions.
Which of the following is TRUE about the plan?（ ）A． Ninety-five theatres have received funding.B． Everyone will get at least one free ticket.C． It may not benefit all the young people.D． Free tickets are offered once every day.
When should you conduct a visual inspection of your towline?A.Whenever its serviceability is in doubtB.In accordance with the manufacturer's recommendationC.At least once a monthD.All of the above
If your passenger vessel is fitted with a loudspeaker system，it must be tested at least once ______.A.every weekB.a dayC.every tripD.a watch or once a trip，whichever is shorter
You should log all barometer readings taken at sea ______.A.regularlyB.at least once during each watchC.more often under changeable weather conditionsD.All of the above
用频谱多普勒测肺动脉高压的肺动脉血流的特点A.血流加速时间及射血时间延长(AT,ET)，射血前时间延长(PEP)B.AT,PEP延长，ET缩短C.AT,E.T缩短，PEP延长D.AT,ET,PEP均缩短E.AT和ET无变化，PEP延长
______ of the following statements is（are）correct regarding motor lifeboats on cargo vessels．① The motor of each lifeboat shall be operated in the ahead and astern position for a period of not more than 5 minutes once in each week；② The fuel tank of all motor-propelled lifeboats shall be emptied and the fuel changed at least once in every year．A.① onlyB.② onlyC.Both ① and ②D.Neither ① nor ②
A data center has had a power outage. Which of the following should the administrator do FIRST once the power is restored?（）A、Identify which systems are the most critical and bring them up by level of importance.B、Retrieve the latest backup tapes for immediate system restore using the GFS rotation.C、Identify the least critical systems and then power those systems on first.D、Determine the cause of the power outage and install UPS systems to prevent its reoccurrence.
单选题The law requires that everyone_____ his car checked at least once a year.AhasBhadChaveDmust have
单选题A data center has had a power outage. Which of the following should the administrator do FIRST once the power is restored？ （）A Identify which systems are the most critical and bring them up by level of importance.B Retrieve the latest backup tapes for immediate system restore using the GFS rotation.C Identify the least critical systems and then power those systems on first.D Determine the cause of the power outage and install UPS systems to prevent its reoccurrence.
单选题If your passenger vessel is fitted with a loudspeaker system，it must be tested at least once （）.Aevery weekBa dayCevery tripDa watch or once a trip，whichever is shorter
单选题You are responsible for implementing maintenance jobs on a SQL Server 2005 database server. Certain jobs run every Sunday and other jobs run at the beginning of every month. You need to schedule the jobs in the way that uses the least amount of administrative effort. What should you do？（）ACreate a job schedule that runs every Sunday.Assign weekly tasks to this schedule.Create a second schedule that runs on the first day of every month. Assign monthly tasks to this schedule.BCreate a job for each task that runs once a day. Use a Transact-SQL statement to check the date and day of the week. If the day is either a Sunday or the first day of the month， execute the code.CCreate a job schedule that runs once a day. Assign jobs to this job schedule. If the day is either a Sunday or the first day of the month， execute the jobs.DCreate a job for each task that runs once a week on Sunday. Add a second job schedule that runs the job on the first of the month
单选题You are responsible for implementing maintenance jobs on a SQL Server 2005 database server. Certain jobs run every Sunday and other jobs run at the beginning of every month. You need to schedule the jobs in the way that uses the least amount of administrative effort. What should you do? （）A Create a job schedule that runs every Sunday. Assign weekly tasks to this schedule. Create a second schedule that runs on the first day of every month. Assign monthly tasks to this schedule. B Create a job for each task that runs once a day. Use a Transact-SQL statement to check the date and day of the week. If the day is either a Sunday or the first day of the month, execute the code. C Create a job schedule that runs once a day. Assign jobs to this job schedule. If the day is either a Sunday or the first day of the month, execute the jobs. D Create a job for each task that runs once a week on Sunday. Add a second job schedule that runs the job on the first of the month.
单选题Fire protection regulations for towing vessels require that all crew members participate in drills and receive instruction at least once a month. Who is responsible for ensuring that this takes place?（）AThe Officer in Charge，Marine InspectionBThe Master，or person in charge of the vesselCThe vessel's owner or managerDThe company's port captain or port engineer
单选题All lifeboats，rescue boats，and rigid-type liferafts shall be stripped，cleaned，and thoroughly overhauled at least once every（）.A6 monthsByearC18 monthsDtwo years
单选题On a ship，each emergency generator must be tested at least once each（）.AweekBmonthCthree monthsDsix months