单项选择题
A.fittings B.riggings C.equipment D.device
Each cover consists of two or （）panels.A.twoB.oneC.more...
单项选择题Each cover consists of two or （）panels.
A.two B.one C.more D.much
A （）is at the end of the cargo runner for picking up th...
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
The （）is fixed at the bottom of the derrick.A.gooseneck...
单项选择题The （）is fixed at the bottom of the derrick.
A.gooseneck B.block C.derrick step D.crane
