單項選擇題A block that can be opened at the hook or shackle end to receive a bight of the line is a（）.
A.bight block
B.gin block
C.heel block
D.snatch block
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1.單項選擇題You can safely step in the bight of a line（）.
A.when it is not under strain
B.if both ends are made fast
C.in an emergency
D.at no time
2.單項選擇題When a pilot is on board to pilot the vessel the Letter（）must be hoisted.
A.G
B.H
C.B
D.N