单项选择题

Each cover consists of two or （）panels.

A.two
B.one
C.more
D.much

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单项选择题
A （）is at the end of the cargo runner for picking up the load.

A.sling
B.hook
C.block
D.tackle
单项选择题
The （）is fixed at the bottom of the derrick.

A.gooseneck
B.block
C.derrick step
D.crane
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