单项选择题

In nautical terminology a dog is a（）.

A.crow bar
B.device to force a water tigh door against the frame
C.heavy steel beam
D.wedge

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单项选择题

In order for combustion to occur inside a piping system such as a vapor collection header in a marine emmission control system , there must be（）.

A.fuel
B.oxygen
C.ignition
D.All of the above

单项选择题

In order to correctly open a new coil of manila line,you should（）.

A.pull the tagged end from the top of the coil
B.pull the tagged end through the eye of the coil
C.secure the outside end unroll the coil
D.unreel the coil from a spool