塔板上汽、液接触的情况随流速的变化而不同,大致可分为()、()、()、()四种接触。

题型:填空题

问题:

塔板上汽、液接触的情况随流速的变化而不同,大致可分为()、()、()、()四种接触。

考点:芳烃抽提操作工中级芳烃抽提操作工中级芳烃抽提操作工题库
题型:填空题

阅读理解。

      Doctors tell us that holidays are necessary. We should rest from work for one or two weeks every

year, if it is possible, they say, we should leave our homes and go to another part of the country. We

should go away for a holiday. Then, after the holiday, we return home and we'll be fresh (有精神的)

and ready (准备) for another year of work. 

     This seems to be true (真的) for most adults (成年人) and young children but not for the old. Some

people do not like leaving their homes to stay in strange places and they do not like a sudden (突然)

change in their lives. They like their homes best of all.

阅读后判断正(T)误(F)。

( )1.Doctors say that we should have a good rest when we are tired.

( )2.We must leave our homes for vacation.

( )3.Only adults can rest a lot from hard work.

( )4.All the old people don't like to stay in strange places for holidays.

( )5."return" means get back or come back.

题型:填空题

利用所学知识判断,错误的一组是(  )

A安全常识B生活中的物质
H2、CH4都是可燃气体--点燃前须检验纯度

炒菜油锅不慎着火--立即用锅盖盖灭

签字笔芯的塑料管材--属有机合成材料

矿泉水煮沸,蒸汽冷凝后--得到的水为软水

C化学常识D元素与人体健康
一大化学发明--将水转变为汽油

一则广告用语--本产品不含任何化学元素

缺铁--易引起贫血

喝牛奶--有利于补钙

A.A

B.B

C.C

D.D

题型:填空题

在国际单位制中电功率的单位是:

A.焦耳

B.瓦特

C.千瓦时

D.伏特

题型:填空题

分析讨论水果加工过程中,哪些对象宜用机械方式进行清洗。

题型:填空题

发生急性心肌梗死时,血清酶中升高最早的是

A.谷草转氨酶
B.乳酸脱氢酶
C.乳酸脱氢酶同工酶
D.肌酸磷酸激酶同工酶

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