问题 单项选择题

薄膜浓缩效率高的主要原因是

A.蒸发温度低

B.药液沸点低

C.气化表面大

D.药液流速快

E.加热蒸汽温度高

答案

参考答案:C

解析:薄膜浓缩系指药液在快速流经加热面时,形成薄膜并且因剧烈沸腾产生大量的泡沫,达到增加蒸发面积,显著提高蒸发效率的浓缩方法。故答案是C。

阅读理解

To Make Everybody Happy

Peter’s uncle lives in the country. Once in summer, Peter goes to stay with him for a few weeks. Whenever they go for a walk or for a drive in the car and pass somebody, his uncle waves to the passer-by. Peter is surprised and says, “Uncle Georage, you seem to know everybody here. Where did you meet them all?”

“I don’t know all these people.” answers his uncle. “Then why do you wave to them?” “Well, Peter ,” says his uncle “When I wave to someone who knows me, he is pleased. He goes on his journey with a happier heart. But when I wave to someone who doesn’t know me , he is surprised and says to himself, ‘ Who is that man? Why did he wave to me?’ So he has something to think about during the rest of his journey, and that makes his journey seem shorter.So.I.make.everybody.happy.

小题1: Peter goes to the country_______.

A.for his winter holidays

B.to see his sick uhcle

C.to spend summer with his uncle

D.because he gets into trouble小题2:When they pass somebody at any time,________.

A.George will stop and say hello to everybody

B.Peter’s uncle waves to the passer-by

C.Peter waves to the pass-by

D.Geoge introduces the person to Peter小题3:Peter ________ when he sees uncle waves to everybody passing by.

A.always asks his uncle “Who is that man?”

B.is very happy

C.is not surprised at all

D.is very surprised小题4:Georage tells peter________.

A.he knows all the people

B.he does not know all the people

C.he only knows one of them

D.he doesn’t know any one of the people小题5:George waves to every passer – by________.

A.to make everybody happy

B.to make Peter happy

C.only to make joke

D.to make himself happy

问答题 简答题