氯仿和水是否能用分液漏斗分开？为什么？
参考答案：
能，因为氯仿不溶于水。
. After I returned to my hometown, I was pleased to find that it had a new look.
A．taken off
B．taken after
C．taken in
D．taken on
离心泵的密封环和叶轮的间隙在（）之间。
A、0～1mm
B、0.1～0.5mm
C、0.5～0.6mm
D、0.6～0.7mm
