在危险货物积载中,表示在纵向或垂向上相隔一个液火密舱室配装的隔离法称为()。
A.隔离4
B.隔离3
C.隔离2
D.隔离1
参考答案:B
Having a walk after supper is certainly good for the old people, but it remains ______ whether
they will enjoy it.[ ]
A. to see
B. to be seen
C. seeing
D. seen
铁排出主要由()。
A.胆汁或粪便
B.尿液
C.出汗
D.皮肤细胞代谢
E.呼吸道