A.降液管泡沫高度等于板间距与溢流堰高之和;
B.降液管内清层高度等于板间距与溢流堰高之和;
C.两板之间充满泡沫层;
D.板上清液层高度超过降液管内清液层高度。
第8题
reminder, and main idea. A further disadvantage is the traffic problems that they cause in many cities and towns of the world. Transition: ___________________ Reminder: ___________________ Main idea: ___________________
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