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阅读理解 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两 多余选项。 For several years, Americans have enjoyed teleshoppingwatching TV and buying things by phone. 1 In a number of European countries, people can turn on their TVs and shop for clothes,jewelry, food, toys, and many other things. 2 For example, the biggest Swedish company sells different kinds of things on TV in 15 European countries, and in one year it made $100 million. In France there are two teleshopping channels, and the French spend about $ 20 million a year to buy things through those channels. In Germany, until last year teleshopping was only possible on one channel for 1 hour every day. Then the government allowed more teleshopping. Other channels can open for telebusiness, including the largest American teleshopping company and a 24hour teleshopping company. 3 Some people like teleshopping because it allows them to do their shopping without leaving their homes. With all the problems of traffic in the cities, this is an important reason, but at the same time, other Europeans do not like this new way of shopping. 4 Many Europeans usually worry about the quality of the things for sale on TV. Good quality is important to them,and they believe they cannot be sure about the quality of the things on TV. 5 They will have to be more careful about the quality of the things they sell. They will also have to w ork harder to sell things that the buyers cannot touch or see in person. A. Now teleshopping is starting in European. B. They call teleshopping “Junk on the air”. C. Teleshopping is becoming popular in Sweden. D. German businesses are hoping this new teleshopping    will help them sell more things. E. The need for high quality means that European teleshopping companies will have to be different from the  American companies. F. Teleshopping is popular among people. G. German teleshopping business is controlled by American.
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【简答题】定量泵节流调速系统中,泵的供油一部分按速度要求由流量阀调节后流往执行元件,多余油液由 流回油箱,同时也就稳定了泵的供油压力。
【单选题】马克思主义认为,实施全面发展教育的最根本的途径是( )。
A.
教劳结合
B.
课堂教学
C.
课外活动
D.
班级活动
【单选题】钩突为胰头的一部分,它的前方为( )
A.
门静脉
B.
下腔静脉
C.
肠系膜上静脉
D.
腹主动脉
E.
以上都正确
【多选题】标注零件尺寸时,应选择基准,基准有( )。
A.
设计基准
B.
工艺基准
C.
精度基准
【判断题】傅里叶描述法的主要特点一是二维问题一维化,二是可用前面若干个较大的傅里叶系数来近似描述目标边界。
A.
正确
B.
错误
【多选题】零件尺寸基准的选择原则( )。
A.
在标注尺寸时,尽量把设计基准和工艺基准统一起来。
B.
零件的主要尺寸应从设计基准出发,对其余尺寸考虑到加工和测量的方便,一般应从工艺基准标出。
C.
零件图上常用作为基准的有:零件上主要回转面的轴线、对称平面、主要加工面。
D.
轴类零件的尺寸基准选择左、右两端面。
【单选题】HC是由于混合气过稀、点火不良、排气门损坏等原因造成燃烧( )而产生的。
A.
完全
B.
过度
C.
不完全
D.
都不是
【单选题】关于煮沸法描述,错误的是
A.
常用于食具的消毒
B.
煮沸100℃ 5分钟可杀死细菌的繁殖体和芽胞
C.
可用于一般手术器械、注射器、针头的消毒
D.
但不足以杀死所有芽胞
E.
水中加入1% ~ 2%碳酸氢钠,可提高沸点到105℃
【单选题】马克思主义认为,实施全面发展教育的最根本途径是
A.
教劳结合
B.
课堂教学
C.
课外活动
D.
班级活动
【单选题】关于煮沸法的描述错误的是
A.
煮沸100℃ 5分钟可杀死细菌繁殖体和芽胞
B.
常用于食具、刀剪等的消毒
C.
水中加入2%碳酸氢钠,可提高沸点达105℃
D.
海拔高度影响水的沸点
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