下列各项中,不属于微生物作用的是[ ]
A.帮助植物传粉受精
B.使动植物和人患病
C.引起食物腐败
D.产生抗生素
答案:A
—So you missed the meeting.
—________. I got there five minutes before it finished.[ ]
A. Not at all
B. Not exactly
C. Not especially
D. Not really
气体液化的两个条件:降低温度、增加压力。氯气液化的临界温度(),临界压力Pc=7.61mPa。