单项选择题
A life preserver or buoyant work vest is required to be worn on a ship when a person is （）.
A.working on the rig floor
B.working over water
C.working on the pipe racks
D.operating line throwing equipment
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单项选择题
A latitude line will be obtained by observing a body （）.
A.on the prime vertical
B.on the celestial horizon
C.at lower transit
D.on the Greenwich meridian -
单项选择题
A lashing used to secure two barges side by side，lashed in an "X" fashion，is called a （）.
A.quarter line
B.back line
C.peg line
D.jockey line -
单项选择题
A lashing used to secure two barges side by side，lashed in an "X" fashion，is called a （）.
A.scissor wire
B.towing wire
C.breast wire
D.cross wire
