单项选择题

The lifesaving signal indicating You are seen - assistance will be given as soon as possible is the（）.

A.vertical motion of white flags
B.vertical motion of a white light or flare
C.firing of a green star signal
D.None of the above

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The holding power of an anchor is the（）.

A.maximum sustained vertical load an anchor will resist before dragging
B.maximum sustained horizontal load an anchor will resist before dragging
C.maximum sustained vertical load an anchor will resist before the mooring line breaks
D.maximum sustained horizontal load an anchor will resist before the mooring line breaks

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The hoist line primarily used for lifting personnel on ship cranes is called the（）.

A.personnel line
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The hinge fitting used to attach the boom to the mast is the（）.

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