当船舶被滞留时应通知（）。
A.船旗国
B.船级社
C.船公司
D.代理
参考答案：A
Generally speaking, when ____ according to the directions, the drug has no side effect.
taking B. taken C. to take D. to be taken
表达载体和基因工程一般克隆载体在元件构成上有何差别？
