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單項選擇題

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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單項選擇題

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

單項選擇題

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