以上表面活性剂中毒性最强的是（）
A.司盘80
B.吐温80
C.肥皂类
D.氯苄烷铵
E.西土马哥
参考答案：D
Sometimes we have much homework to do, but not often. Anyway, it ______in time.
A．can finish
B．should finish
C．can be finished
D．should be finished
无形资产的摊销时间：有收益年限的，按收益年限摊销，无收益年限的，按不少于（）年摊销
A、5
B、7
C、9
D、10
