单项选择题
A.brace it with dunnage B.cover it with large pieces C.fill it with small pieces D.leave it as it is
A.a check valve will close that prevents reverse circulation B.a centrifugal counterweight counteracts the force of gravity C.the electric pump motor will cut out D.the control lever will move to the stop position
A.going from a warm to a cold climate B.the dew point of the outside air is greater than the dew point of the air in the hold C.the dew point of the air in the hold is very low D.the outside dew point is 16℃ and the cargo temperature is 12℃