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问题
问答题 简答题
精馏是怎样分类的?
答案
参考答案:
(1)按精馏操作方式不同,可分为间歇精馏和连续精馏。
(2)按精馏操作的条件(如压力)不同,可分为加压精馏、常压精馏、减压精馏等。
选择题
The two friends ____ on the Internet for three hours, and they would go on till the next morning.
A. had been chatting
B. had chatted
C. were chatting
D. have been chatting
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问答题 简答题
概括细菌细胞内的转录过程。
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