單項(xiàng)選擇題

An airplane should NOT send which signal in reply to a surface craft?（）

A.Opening and closing the throttle
B.Rocking the wings
C.Flashing the navigational lights off and on
D.Flashing Morse T

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單項(xiàng)選擇題

An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.

A.has long life
B.is light weight
C.absorbs shock
D.has fine adjustment

單項(xiàng)選擇題

An advantage of the Christmas Tree towing method is to（）.

A.increase the towing hawser's catenary and provide more spring
B.reduce catenary，allow operation in shallower water，and to release one barge without breaking up the entire tow
C.enable one tug and its crew without any outside assistance to make up or break down the tow
D.provide rapid delivery of logs from the northwestern United States to Hawaiian sawmills