单项选择题

如图所示，对图Ⅰ和图Ⅱ所示结构，以下论述正确的是（　　）。

A.Ma＜Mb，方向相同
B.Ma＜Mb，方向相反
C.Ma＞Mb，方向相同
D.Ma＞M，方向相反

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单项选择题

Which statement concerning GMDSS Radio Operator requirements is FALSE ________．A.Each compulsory vessel must carry at least two licensed GMDSS Radio Operators at all times while at seaB.Each compulsory vessel must carry at least two licensed Radio Operators at all times while at sea and may elect to carry a GMDSS Radio Maintainer as wellC.Communications involving safety of life at sea do not have to be logged as long as the compulsory vessel was not involved in such communicationsD.While at sea，adjustments to，and the maintaining of，GMDSS equipment may be performed by the GMDSS Radio operator as long as the work is supervised by an onboard licensed GMDSS Radio Maintainer

A.A.Each
B.Each
C.Communications
D.While

单项选择题

所示结构，杆Ⅰ的内力为下列何值？（）

A.见图A
B.见图B
C.见图C
D.见图D

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