单项选择题

图所示悬臂梁截面12cm×20cm，受弯允许的应力为[σ]＝1.0kN/cm2，则荷载P应不大于（　　）。

A.4.0kN
B.6.0kN
C.8.0kN
D.10.0kN

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单项选择题

What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received ________．A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequencyB.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was receivedC.The Operator should immediately set continuous watch on VHF channel 70D.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

A.A.No
B.The
C.The
D.The

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What publications should a GMDSS Operator consult regarding the proper set-up and operation of vessel equipment ________．A.ITU PublicationsB.The manufacturers instruction manualsC.Part 90 of the FCC Rules and RegulationsD.Code of Federal Regulations，Title 47，Part 80，Subpart W

A.A.ITU
B.The
C.Part
D.Code

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