YB45型包装机八号轮烟包出口的保养内容有()。A、需清洁烟包输出槽两条皮带的连扳B

题型:单项选择题

问题:

YB45型包装机八号轮烟包出口的保养内容有()。

A、需清洁烟包输出槽两条皮带的连扳

B、需松开上下输送皮带,检查皮带输送辊的灵活情况,以及皮带入口处下方导板的灵活情况

C、打开从八号轮到输出皮带的传送上压板,用压缩空气和抹布清除胶垢

D、以上A/B/C三项全是

考点:烟机设备修理工考试烟机设备修理工(包装)烟机设备修理工(包装)题库
题型:单项选择题

阅读短文,选择正确答案。

     Perhaps you have heard a lot about the Internet, but what is it?

     The Internet is many different networks (网络) around the world. A network is a group of computers put

together. These networks joined together are called the Internet.

     Maybe that doesn't sound interesting. But when we've joined the Internet, there are lots and lots of things

we can do. We can have a lot of interest on the World Wide Web(www). We can use the Internet instead of a

library to find all kinds of information for our homework. We can find information about our favourite sports or

film stars and do shopping on the Internet. We can also send messages to other people by e-mail. It is much

cheaper and quicker than calling our friends or sending a letter.

     With the help of the Internet, the world is becoming smaller and smaller. People can now work at home with

a computer in front, getting and sending the information they need.

     They can buy or sell the things they want by the Internet. But do you know 98% of the information is in

English? So what will English be like tomorrow?

1. The passage is mainly about _______.[ ]

A. the Internet

B. information

C. computers

D. e-mail

2. The quickest and cheapest way for people to send messages to their friends is ________.[ ]

A. by post

B. by e-mail

C. by telephone

D. by TV

3. The Internet can not be used to _______.[ ]

A. find information for our homework

B. get some information about our favourite sports stars

C. do some shopping

D. do our housework

4. Which of the following is NOT true? [ ]

A. The Internet is a big computer.

B. The Internet is lots of computer networks.

C. The Internet is very helpful.

D. People can work at home with the help of the Internet.

5. What does the writer try to tell us with the last two sentences? [ ]

A. The Internet is more and more popular.

B. All the information is in English.

C. English is important in using the Internet.

D. Every computer must join the Internet.

题型:单项选择题

下列金属变形说法正确的是()。

A.金属变形较小,应力集中的部位,电位低。

B.金属变形较小,应力集中的部位,电位高。

C.比强度高

D.金属变形较大,应力集中的部位,电位高。

题型:单项选择题

下列哪项不是儿茶酚胺与受体结合后产生的效应()

A.血管收缩

B.妊娠子宫收缩

C.扩瞳肌收缩

D.小肠平滑肌收缩

E.竖毛肌收缩

题型:单项选择题

简述OSAHS的病因。

题型:单项选择题

目前,天津港主航道引导灯桩中标轴线两侧各()米为导标通视区,通视区内不得建设任何高大建筑物及碍航的照明设施。

A、180

B、150

C、120

D、100

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