單項(xiàng)選擇題A wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from（）.

A.filling completely
B.developing free surface
C.developing free surface moment
D.collapsing


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1.單項(xiàng)選擇題A tackle is two blocked when the blocks are（）.

A.equally sharing the load
B.jammed together
C.as far apart as possible
D.rove to the highest mechanical advantage

2.單項(xiàng)選擇題A sweep oar is an oar that is（）.

A.generally shorter than the others and is used to steer with
B.is longer than the others and is used as the stroke oar
C.is raised in the bow of the boat for the steersman to steer by
D.longer than the others used for steering

3.單項(xiàng)選擇題A stopper is（）.

A.a short length of line used for temporarily holding another line
B.a snatch block for handling a topping lift
C.an engine order telegraph
D.the brake on a cargo winch

4.單項(xiàng)選擇題A stay is（）.

A.standing rigging
B.a downhaul
C.a halyard
D.a jib

5.單項(xiàng)選擇題A spring line leads（）.

A.fore and aft from the ship's side
B.to the dock at a right angle to the vessel
C.through the bull nose or chock at the bow
D.through the chock at the stern