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单项选择题

电路主要由负载、线路、电源、（      ）组成。  A.
变压器  B.
开关  C.
发电机  D.
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单项选择题
Which of the following is NOT true about the Times?
A．Murdoch began to become famous through the purchase of The Times.
B．When John Walter III controlled the paper, he built the reputation of The Times.
C．The Times is the most popular newspaper in the U.K.
D．It was the founder, John Walter, who changed the name to The Times.
判断题
冲击式水轮机的特征是水流以自由水流的形式冲击转轮，利用水流动能
问答题
Translate the following sentences into Chinese.
1. Hence, it is important to have professional titles, precise key words, clear descriptions, pictures, complete features, reasonable prices, free shipping and in-time preparation of goods.
 
2. Proper use of these key words helps to promote your goods among relevant goods online and helps buyers search for your products. 
3. In e-business, the choice of good key words is of utmost importance because most buyers get to sellers via searching, which leads to interest in the goods and real contact with sellers. 
4. AliExpress extracts a number of key words from hot selling products that buyers are most concerned about through induction of more than 50 key industry buyers demand. 
5. These hot keywords can be reasonably applied to the title, attributes and detailed description to enhance the quality of product information display, win more orders.
6. Display detailed product information to the customers that are not included in the name and detail of products. They can also display information that customers are concerned with such as product features, functions, service, packaging and shipping.
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