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（）operation, any obstacles in the way of hatches must be removed and cleaned.
- A、Before
- B、During
- C、After
- D、Within
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单选题（）operation, any obstacles in the way of hatches must be removed and cleaned.A
BeforeB
DuringC
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Within
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Backup RB2 at log sequence number 15622 on 12th JanC
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单选题The successful operation of any engine or machine and （） depend on effective lubrication.A
their no trouble periodB
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ventilate all compartments，see that the machinery is clean and there are no obstructionsB
just turn the key and start upC
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单选题Faulty operation of any system is indicated by very definite （）.A
symptomsB
samplesC
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单选题在下列程序语句中，为任务间添加依赖关系的是（）。A
[operation1 addDependency：operation2]；B
[operation addExecutionBlock：^{}]；C
[operation waitUntilFinished]；D
[operation cancel]；
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