题目内容

If you wishied to transmit a message by voice concerning the safety of navigation, you would preface it by the word ______.

A. Mayday
B. Pan-pan
C. Securite
D. Safety

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If you know that the vessel you are about to call on the VHF radio maintains a radio watch

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施工升降机在运行的时候，禁止揩拭、清洁、润滑、和修理机件。()

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Ｄ.螺旋试验

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A. 旋回圈增大，舵效变差
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C. 旋回圈变大，舵效变好
D. 旋回圈变小，舵效变好