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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1.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
2.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
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