四、演绎推理：共10题，每题1分，共10分。每题给出一段陈述，这段陈述被假设是正确的，不容置疑的。要求

During which condition should the operator of a pedestal crane shutdown operations ()

A.Lightning in the vicinity

B.An approaching squall line

C.A fire on the pier

D.All of the above

A.Bunkering barge alongside

B.Potable water spill on deck

C.Crane hydraulic hose bursts

D.Trim greater than 4 feet

A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency

B.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received

C.The Operator should immediately set continuous watch on VHF channel 70

D.The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received

Inspection of a vessel’s propeller during dry-dock should include .

A.noting the condition of the fairwater

B.inspection of the keyway

C.logging inspection results in the official deck log

D.all of above

A、condition, true

B、condition, false

C、equality operator, true

D、relational operator, true

Which of the following statements best describes the condition of the passengers？

A．No one was fatally injured.

B．There were many heavy casualties.

C．No one was hurt during the accident.

D．Someone was killed during the accident.

Which of the following statements best describes the condition of the passengers？

A．No one was fatally injured.

B．There were many heavy casualties.

C．No one was hurt during the accident.

D．Someone was killed during the accident.

A、The location of the accident.

B、The time of the accident.

C、Whether anyone is injured in the accident.

D、The description of the involved vehicle.

A. You cannot use IN operator in a condition that involves an outerjoin.

B. You use () on both sides of the WHERE condition to perform an outerjoin.

C. You use (*) on both sides of the WHERE condition to perform an outerjoin.

D. You use an outerjoin to see only the rows that do not meet the join condition.

E. In the WHERE condition, you use () following the name of the column in the table without matching rows, to perform an outerjoin.

F. You cannot link a condition that is involved in an outerjoin to another condition by using the OR operator.