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單項選擇題

You can swing the derrick to starboard side or port side. But do not exceed （）for the union purchase.

A.120°
B.90°
C.60°
D.100°

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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

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

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