單項(xiàng)選擇題When air is at its dew point it().

A.will contain no additional moisture
B.has the lowest relative humidity
C.cannot keep up its moisture
D.has a low absolute humidity


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1.單項(xiàng)選擇題When cargo is shifted from the main deck into the lower hold of a vessel,().

A.The metacenter will move downward
B.The GM will increase
C.The center of buoyancy will move upward
D.The list of the vesel will become great

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題When the truck does not work, the driver should()engines.

A.turn on
B.turn off
C.shut up
D.close

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題When working with lumber, wire and staples are not desirable to be used because().

A.they are not subjected to cause trouble
B.they are difficult to handle this kind of cargo
C.the efficiency of separating is raised
D.the efficiency of loading is greater