通常用的油管是（）。
A.N80，3″
B.N80，2.5″
C.J55、3
D.J55、2.5
参考答案：A
物流的定义为物品从供应地向接受地的实体流动过程。
Mr Smith was driving fast to take his wife to the nearest hospital because their baby was________.
A．on its way
B．in the way
C．by the way
D．out of the way
