表面活性剂在药剂中常作
A.增溶剂
B.乳化剂
C.润湿剂
D.润滑剂
E.去污剂
参考答案:A,B,C
-Do you have the time?
-Sorry, I have no watch.
-_____________.
A.What a shame.
B.Thanks anyway.
C.It doesn’t matter.
D.Why not buy one?
内燃机车正线运行允许速度为()Km/h。