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【简答题】
Winter is dangerous because it’s so difficult to know what is going to happen and accidents take place so easily. Fog can be waiting to meet you over the top of a hill. Ice might be hiding under the melting (融化) snow, waiting ahead to send you off the road. The car coming to you may suddenly slip(滑) across the road. Rule No.1 for driving on icy roads is to drive smoothly (平稳地). Sudden movements can make a car very difficult to control. So every time you either start or stop your car, increase or reduce your speed, you must be as gentle and slow as possible. Suppose you are driving with a full cup of hot coffee on the seat next to you. Drive so that you wouldn’t spill (溅) it. Rule No.2 is to pay attention to what might happen. The more ice there is, the further down the road you have to look. Test how long it takes to gently stop your car. Remember that you may be driving more quickly than you think. Generally, allow twice of your usual stopping distance when the road is wet, three times this distance on snow than usual, and even more on ice. Try to stay in control of your car at all time and you will not get into trouble. 小题1:The writer tries to _____ in this passage. A.show his dislikes about bad winter weather B.give information about winter weather C.ask people not to drive in winter D.advise people about safe driving in winter 小题2:According to the passage, the writer thinks that _______. A.people should not drive in the snow B.drivers should think more about problems in winter driving C.people drive too fast in winter D.winter drivers should stop their cars less 小题3:In the passage the writer talks about a cup of coffee ______. A.to show how important smooth movements are B.to ask the drivers to bring some soft drinks with them C.to tell the drivers to be more relaxed D.to show how it can be spilled 小题4:Which of the following is NOT true? A.Traffic accidents take place easily in winter. B.Fog and melting snow often cause car accidents. C.The stopping distance on ice is as long as the usual one. D.In winter you should drive your car with great care.
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【单选题】计算机之所以能够按照人的意图自动地进行操作,主要是因为采用了()。
A.
高速的电子元件
B.
高级语言
C.
二进制编码
D.
存储程序控制
【判断题】四冲程柴油机的一个工作中,进气、压缩和排气三个过程都不做功,而且消耗功,只有燃烧和膨胀过程才是在一个工作循环中唯一做功的过程。()
A.
正确
B.
错误
【单选题】计算机之所以能够按照人的意图自动地进行操作,主要是因为采用了( )。
A.
存储程序控制
B.
高级语言
C.
二进制编码
D.
高速的电子元件
【单选题】计算机之所以能够按照人的意图自动地进行操作,主要是因为采用了( )。
A.
二进制编码
B.
高级语言
C.
存储程序和程序控制
D.
高速的电子元件
【单选题】在柴油机的一个工作循环过程中,只有()冲程是作功的,其他三个冲程都是辅助性质的过程,是为作功过程而准备的。
A.
进气
B.
压缩
C.
燃烧膨胀
D.
排气
【单选题】计算机之所以能够按照人的意图自动地进行操作,主要是因为采用了( )
A.
二进制编码
B.
高级语言
C.
存储程序控制
D.
高速的电子元件
【简答题】在四冲程柴油机的一个工作循环中,只有()冲程是对外作功的,其它3个冲程都是进行辅助性质的过程。
【判断题】四冲程柴油机的一个工作中,进气、压缩和排气三个过程都不做功,而且消耗功,只有燃烧和膨胀过程才是在一个工作循环中唯一做功的过程。
A.
正确
B.
错误
【单选题】计算机之所以能够按照人的意图自动地进行操作,主要是因为采用了( )。
A.
存储程序和程序控制
B.
二进制编码
C.
高级语言
D.
高速的电子元件
【单选题】有关四冲程柴油机的工作特点,下列各项说明中错误的是()。
A.
一个工作循环在曲轴转两转内完成,每一个过程都约占一个活塞冲程
B.
在曲轴转两转过程中,进气阀、排气阀、喷油器均只启闭一次,因此凸轮轴转速比曲轴慢一半;凸轮轴转速与曲轴转速比为2∶1
C.
每一工作循环中,只有作功冲程才对外作功,其余的三个冲程都是辅助冲程,并且要消耗一定的功率
D.
四冲程柴油机与二冲程柴油机在结构上差别:a二冲程柴油机不设进气阀;b二冲程柴油机气缸套设有气口;c二冲程柴油机增加了扫气泵
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