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。
