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單項(xiàng)選擇題

If the freeboard is more than 9 meters, we should rig（）.

A. gangway
B. ladder
C. pilot ladder
D. gangway combined with pilot ladder

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單項(xiàng)選擇題

If the freeboard is less than 9 meters, we should rig（）.

A. a gangway
B. a pilot ladder
C. rope ladder
D. gangway combined with pilot ladder

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