单项选择题
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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单项选择题
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 -
单项选择题
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 -
单项选择题
The exhaust pipe must be gas tight throughout its entire length otherwise（）.
A.bilge water may enter the exhaust pipe
B.entry of air may cause vapor lock
C.carbon monoxide may enter the interior of the vessel
D.the joint gaskets may be blown
