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單項選擇題

When the derrick is lowered, the guys must be （）.

A. slacked off
B. taken in
C. send away
D. send out

你可能感興趣的試題

單項選擇題

When the derrick is topped, the guys must be （）.

A. slacked off
B. send away
C. taken in
D. send out

單項選擇題

Do you want the derrick adjusted （）?

A. up and down
B. upwards or downwards
C. upside or downside
D. forwards and backwards

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