单项选择题
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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A.has long life
B.is light weight
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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
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An “on-load” release system on a survival craft means the cable can be released（）.
A.only when the load is taken off the cable
B.only when there is a load on the cable
C.only when activated by the controls at the lowering station
D.at any time
