管道运输方式被广泛地运用于（）。
A.铁路
B.公路
C.原油
D.成品油
E.天然气运输
参考答案：C, D, E
商业无菌是指在保质期内（）
A、产品无致病微生物
B、无微生物毒素
C、在正常的仓储运输条件下微生物不发生增值的状态
A vessel would be referred to as tender when the weight of the cargo is（）.
A.evenly distributed vertically and the double bottoms are full
B.concentrated low and the double bottoms are empty
C.concentrated low and the double bottoms are full
D.concentrated high and the double bottoms are empty
