问题 问答题 简答题

在冷凝液泵机械密封漏的倒泵操作过程中,为什么要先关原运行的真空平衡阀再停泵?

答案

参考答案:

在机组运行过程中,表冷器内处于真空状态,如果不关其平衡阀即停泵,那么空气就会从平衡管吸入表冷器内,造成真空度下降。

阅读理解

Running is becoming popular these days .Many of us run for health. Doctors say most of the health problems come from these bad habits:eating too much, drinking too much,smoking(吸烟), and not taking exercise. Doctors tell us,“Eat and drink less, and exercise more.”

Running is good because it helps build a strong heart.. It also helps most fat people lose weight(重量). A 68-year-old woman runs three times a week. She runs to lose weight . “I want to look beautiful, but I love to eat , ”she says.

Running is good for health in other ways, too. Many runners say running keeps many small health problems away. “Running is my doctor,”says a man.

Running can also help people relax,so today men and women of all ages enjoy running.

根据短文内容,选择正确的答案。(10分)

小题1:Many people enjoy running because they want to                .

A.keep healthy          B.eat much        C.run fast

小题2:Doctors tell us to            more.

A.drink                B.eat             C.exercise

小题3:The underlined phrase “lose weight”means “        ”in Chinese.

A.自信               B.减肥           C.放松

小题4:The last(最后的)paragraph (段) shows          .

A. running can also help people relax

B.running is good for people,s health

C.running helps build a strong heart

小题5:The writer mainly tells us            .

A.how we should run

B.how to lose weight

C.running is a good way to keep fit

单项选择题