单项选择题

When liquid is free to move transversely in a tank, the effect is called（）.

A.Free communication
B.Free fensity
C.Free surface
D.Negative GM

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When the truck does not work, the driver should（）engines.

A.turn on
B.turn off
C.shut up
D.close
单项选择题
When the vessel arrives, the cargo of machinery to be unloaded is（）.

A.transpored to the ships side
B.transported into the shed
C.lashed and secured
D.delivered to the consignor
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