使用手电钻等移动的电动工具是,其引线不能有接头,长度不超过()。A.5m B.10m

题型:单项选择题

问题:

使用手电钻等移动的电动工具是,其引线不能有接头,长度不超过()。

A.5m

B.10m

C.15m

D.20m

考点:制冷工考试制冷工考试题库
题型:单项选择题

阅读理解。

根据短文内容,判断下列句子的正误,正确的用“T”错误的用“F”。

     Have you ever been to Ireland? If not, you should think of spending a vacation there. The Republic of

Ireland stands in the south of the island. There are about 3,470,000 people in the country and the weather is

 quite wet but warm. The temperature is neither too high nor too low. Fails of snow in Ireland are most

unusual. Whenever you go there, you can hardly see them. Ireland is full of interesting things to do. You'll find

restaurants and cafés everywhere. Most of them have a long list of Irish food and drinks. Especially, after your meal, you can take a walk along the shore. The countryside is good for horse riding. Other sports you may

want to do are sailing, boating, swimming, fishing and golfing.

      Ireland is famous for its theaters and festivals. So why don't you stay longer for a party, an opera or a

concert? The Irish people are kind and friendly. From mountains to beaches you will find people ready to stop

and talk about the weather, the local geography or history.

     The Irish people have kept their own culture of music and literature (文学) well. Different areas have

different kinds of music. In towns and villages people get together in the evening to sing and play music. They

also get together to read their own poems to each other. Meeting such people is really fun, isn't it?

( )1. It rains and snows a lot in Ireland.

( ) 2. Irish food and drinks are not easy to find in the countryside.

( )3. There are many sports to do on the water in Ireland.

( )4. The Irish people seldom talk about their history and literature.

( )5. The Irish people are good at music and poems.

题型:单项选择题
从短文后各题所给的A、B、C、D四个选项中,选择最佳选项。
My son lives in a big city in France. People there are very busy. There are many supermarkets and 1 on the streets. It is very easy to go 2 . You can buy a lot of nice things there. My son works in a restaurant. He 3 Chinese food there. There is a big cinema (电影院) near my son’s home  4 he often goes to the movies. Life in the city is colorful. There are a lot of 5 of interest to visit. Also, it is easy for them to take a bus to 6 other cities from theirs.
I like country (乡村) life best. That’s 7 I don’t like to live in the city with my son. Here, in the country, I can 8 the fields (田地) and plants. Sometimes some little animals 9 in my garden. I think it’s very 10 to be in this kind of quiet and fun place.
小题1:
A.hospitalsB.restaurantsC.shopsD.banks
小题2:
A.runningB.swimmingC.shoppingD.sleeping
小题3:
A.takesB.seesC.findsD.cooks
小题4:
A.orB.andC.becauseD.but
小题5:
A.roomsB.citiesC.placesD.countries
小题6:
A.get toB.look forC.wait forD.talk about
小题7:
A.whatB.whyC.howD.when
小题8:
A.passB.sellC.enjoyD.eat
小题9:
A.playB.studyC.readD.sing
小题10:
A.boringB.scaryC.excitingD.relaxing
题型:单项选择题

右图是一电池,下列有关说法正确的是

A.该电池负极反应为:2Fe2+-2e-2Fe3+

B.当有6.02×1023电子转移时,Fe电极减少56g

C.石墨电极上发生氧化反应

D.盐桥中K+移向FeCl3溶液

题型:单项选择题

关于DNA分子,说法错误的是()

A.DNA是具有遗传特性的物质

B.碱基G与C通过2对氢键配对

C.维持DNA二级结构的力主要是氢善和碱基堆积力

D.DNA中G+C含量高的区段较A+T含量高的区段稳定

E.DNA是极性分子

题型:单项选择题

某功率均分UPS双机系统已运行5年,近其检查发现其中一台机的母排出现拉弧痕迹,其最可能的原因是()

A、负载太小

B、输出三相不平衡

C、市电电压过高

D、直流电容老化

更多题库