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问题
多项选择题
分馏塔选用固舌形塔盘的好处是（）。
A、操作弹性大
B、处理量大
C、压降较小
D、塔板不易堵塞
答案
参考答案：B, C, D
选择题
—What an exciting match!
—Yes, isn't it? I ______ such a great one before!
A. never saw
B. have never seen
C. had never seen
D. never see
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名词解释
等高线
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