单项选择题

The most common type of davit found on merchant vessels today is the（）.

A.radial
B.sheath-screw
C.gravity
D.quadrantal

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The holding capability of an anchor is primarily determined by the（）.

A.shape of the anchor
B.stowage of the anchor on board
C.anchor's ability to dig in
D.size of the vessel and its draft

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The function of the bypass valve on the self-contained breathing apparatus is to（）.

A.control the pressure of the oxygen as it enters the body
B.allow the wearer to manually give himself oxygen
C.release excess heat which would otherwise cause the bottle to explode
D.allow exhaled gases to pass outside the bottle

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The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.

A.boss
B.knuckle
C.skeg
D.strut