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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1.單項(xiàng)選擇題()will reduce the visibility.

A.dust
B.sea water
C.land sand
D.wind

2.單項(xiàng)選擇題()view of the fact,I wish to submit this report.

A.In
B.On
C.To
D.For

3.單項(xiàng)選擇題()using the derrick at once,the gooseneck is bent.

A.Continue
B.Start
C.Commence
D.Stop

4.單項(xiàng)選擇題()this the Chief Officer agreed not to put any remarks.

A.At
B.By
C.For
D.Upon

5.單項(xiàng)選擇題()there danger of explosion?

A.Is
B.Has
C.If
D.Do