单项选择题
A tackle by which the outer end of a boom is raised and lowered is the topping（）.
A.boom
B.lift
C.raise
D.tackle
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相关考题
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单项选择题
A stopper used in securing the ground tackle for sea that consists of a grab attached to a turnbuckle is a（）.
A.riding pawl
B.buckler
C.devil's claw
D.locking ring -
单项选择题
A splice that can be used in running rigging，where the line will pass through blocks，is a（）.
A.short splice
B.long splice
C.back splice
D.spindle splice -
单项选择题
A snatch block would most likely be used as a（）.
A.boat fall
B.fairlead
C.riding pawl
D.topping lift
