單項(xiàng)選擇題

Four （）are needed to work this heavy derrick.

A.winches
B.gears
C.windlass
D.cranes

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單項(xiàng)選擇題

This （）was repaired in Singapore.

A. damaged derrick
B. damaging derrick
C. derrick to be damaged
D. derrick

單項(xiàng)選擇題

Push the “Oil Jack” position （）until the cover comes to its final closed position.

A.lifted
B.lowered
C.opened
D.closed