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
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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 -
单项选择题
The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a（）.
A.string
B.stand
C.joint
D.standpipe -
单项选择题
The C02 flooding system is actuated by a sequence of steps which are（）.
A.break glass，pull valve，break glass，pull cylinder control
B.sound evacuation alarm，pull handle
C.open bypass valve，break glass，pull handle
D.open stop valve，open control valve，trip alarm
