欲从中药材中提取双糖苷,一般可用()
A.冷水浸渍
B.70%乙醇回流
C.苯回流
D.酸性乙醇浸渍
E.酸性乙醇回流
参考答案:B
.It was the practice _____ he got abroad _____ made him a good English speaker.
A.what; that
B.that; that
C.that; which
D.which; that
《廉政准则》规定,不准违反规定决定或者批准用公款或者通过摊派方式举办各类()活动。
A.开工
B.开业
C.庆典
D.座谈