当气体溶解度很小时,吸收效果主要受()控制。
A.液膜
B.气膜和液膜
C.气相分压
D.气膜
参考答案:A
What's your opinion of Mr.Li's request that we ______ spend half an hour reading English aloud every morning?
A.would
B.should
C.must
D.could
简述机器损坏保险的概念。