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【单选题】

Some vessels are equipped with a water lubricated stern robeWhen at sea, operating under normal conditions, the water service valve from the ships saltwater system to the bearing should be （）.

A、closed, and no leakage permitted across the shaft packing

B、closed, and only slight leakage permitted across the shaft packing

C、open, and no leakage permitted across the shaft packing

D、open, and only slight leakage permitted across the shaft packing

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第1题
[] 我的工具箱里有几把钳子。（）

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第2题
[单选题] 有关等价伪指令EQU和等号伪指令=的说法中，正确的是（）。

A、EQU能对所定义的符号名再重新定义，而=不行  B、=能对所定义的符号名再重新定义，而EQU不行  C、EQU和=都能对所定义的符号名再重新定义  D、EQU和=都不能对所定义的符号名再重新定义  

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第3题
[单选题] You are approaching another vessel and are not sure whether danger of collision exists. You must assume（）.

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第4题
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第5题
[单选题] A vessel which through some exceptional circumstance is unable to maneuver as required by these Rules and is therefore unable to keep out of the way of another vessel is called（）.

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第6题
[单选题] Upon receipt of a distress message，a merchant vessel is bound to proceed to the scene of the distress. Under which of the following cases would this NOT be true?（）

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第7题
[单选题] Class A EPIRBs are required on（）.

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第8题
[单选题] Sailing vessels are stand-on over power-driven vessels except（）.

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第9题
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第10题
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