单项选择题
A.Downhaul B.Backstay C.Halyard D.Sheet
A.Distance line B.Gantline C.Heaving line D.Tag line
A.The bottom block touches the top block B.The line has jumped the sheaves C.There are turns in the fall D.You have two blocks
A.strips of burlap B.heavy paper C.dunnage boards D.strips of rope yarn
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