线绕式异步电动机采用串级调速比转子回路串电阻调速相比()。A、机械特性一样 B、机械

题型:单项选择题

问题:

线绕式异步电动机采用串级调速比转子回路串电阻调速相比()。

A、机械特性一样

B、机械特性较软

C、机械特性较硬

D、机械特性较差

考点:高级维修电工高级维修电工题库
题型:单项选择题

Fire can help people in many ways. But it can also be very harmful. Fire can make water hot and house warm, give light and cook food. But fire can burn (燃烧) things, too. It can make trees, houses, animals and other things catch fire (起火). If some people can't run away from fire, it can kill them. This happens in every country every year.

Sometimes big fire can burn forests. A month ago, a large forest fire broke out in Yunnan Province. It lasted nearly half a month. The forest in Heilongjiang Province and the grassland in Inner Mongolia caught fire in May, 2006. After more than ten days' fight, over 30,000 people and soldiers put out (扑灭) the fire at last.

Nobody knows clearly when people began to make fire, but there are many interesting stories about the first time a man or a woman started a fire. One story from Australia tells about a man who went to the sun and brought fire down a long time ago. Today people know how to make a fire with matches (火柴). Children sometimes like to play with them. But matches can be very dangerous. The match can burn a piece of paper and then it can burn a house. A small fire can become a big fire, and destroy many things. Fire kills many people every year. So you must be careful with fire.

小题1:The main idea of the passage is that _________.

A.fire is dangerous and harmful

B.forest fire can be easily put out

C.who started a fire the first time

D.every month there is a forest fire in Yunnan Province小题2:Matches can be dangerous because _________.

A.they always burn a house

B.they can make things catch fire

C.they can burn a piece of paper

D.they kill many animals every year小题3:The word “destroy” in the passage means ________in Chinese.

A.破灭

B.炸毁

C.毁灭

D.粉碎小题4:The writer of the passage wants to tell us that ________.

A.we know when man began to make a fire

B.people should use fire carefully

C.fire can burn down all things in the world

D.all children like to play with matches

题型:单项选择题
It was almost 9:00 pm when Mia Janson left her office to go home. It was   16  . She started her car and   17  down the dark road that led to her house in the country.
She   18  the radio and listened to songs while she was driving. The heater wasn’t working, and singing helped to keep her    19 .
The snow was heavy. Then Mia went across a small    20 . The bridge was covered with ice and the car went out of control. Mia hit her head on the steering wheel and lost consciousness(知觉).
When she woke up, her head was bleeding (流血),and she was shaking from the cold. She didn’t know   21  she was. Mia opened the car door and looked around. She was under the bridge, and her car was sitting on the frozen river! She felt very sad. She   22  the ice wouldn’t hold her car for very long. She tried to walk up several times, but she kept falling into the snow. Mia tried   23  time. She fell again, but this time she couldn’t get up. She knew that                      24    could see her car under the bridge. She was lying in the snow, and she couldn’t move. Mia closed her eyes and waited to die.
Then she heard a voice. Mia   25  her eyes. There was an old man standing over her. She stood up and walked up with the help of the old man. “That’s my truck”, said the old man. “Get in and I’ll take you home.”
小题1:
A.rainingB.sunnyC.snowingD.windy
小题2:
A.ranB.droveC.walkedD.rode
小题3:
A.turned onB.turned overC.turned offD.turned down
小题4:
A.happyB.excitedC.tiredD.warm
小题5:
A.bridgeB.villageC.townD.farm
小题6:
A.howB.whatC.whyD.where
小题7:
A.knowB.knewC.knowsD.knowing
小题8:
A.oneB.one moreC.otherD.the other
小题9:
A.somebodyB.anybodyC.everybodyD.nobody
小题10:
A.closeB.closedC.openedD.open
题型:单项选择题

下列有关工业生产的叙述正确的是[ ]

A.合成氨生产过程中将NH3液化分离,可加快正反应速率,提高N2、H2的转化率

B.硫酸工业中,在接触室安装热交换器是为了利用SO3转化为H2SO4时放出的热量

C.电解饱和食盐水制烧碱采用离子交换膜法,可防止阴极室产生的Cl2进入阳极室

D.电解精炼铜时,同一时间内阳极溶液铜的质量比阴极析出铜的质量小

题型:单项选择题

RAM是只读存储器,只能将事先存储在存储器的信息读出,而不能在计算过程中再写入信息。

题型:单项选择题

在分销渠道的流程中,下列那些流程的方向是反向的。()

A、洽谈流

B、融资流

C、风险流

D、支付流

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