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單項(xiàng)選擇題

（）will the discharging operations take?

A.How long
B.How length
C.How many times
D.How many shift

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單項(xiàng)選擇題

（）your present speed?

A.How is
B.How are
C.What is
D.What are

單項(xiàng)選擇題

A bad separation makes the cargo（）at its destination.

A.easier to discharge
B.more difficult to discharge
C.easierto load
D.more difficult to load

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