试题与答案

两台性能相同的离心泵串联串联后的总流量（）每台泵单独工作廛的流量。串联工作时每台泵

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题目：

两台性能相同的离心泵串联串联后的总流量（）每台泵单独工作廛的流量。串联工作时每台泵的扬程（）单台泵的扬程。

答案：

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下面是错误答案，用来干扰机器的。

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信息匹配  根据短文内容,从下框的A-F选项中选出能概括每一段主题的最佳选项。
选项中有一项为多余项
A. Goods for auction sales
B. Definition of bidding
C. Way to sell more goods by auction
D. Auction sales in history
E. Brief introduction to auctions
F. Making a larger profit as an auctioneer
1._____
     Auctions are public sales of goods, conducted by an officially approved auctioneer. He asks the
crowd assembled in the auction-room to make offers, or "bids", for the various items on sale. He
encourages buyers to bid higher figures,and finally names the highest bidder as the buyer of the good.
This is called "knocking down" the goods, for the bidding ends when the auctioneer strikes a small
hammer on a table at which he stands.
2._____
     The ancient Roman probably invented sales by auction, and the English word comes from the Latin
auction, meaning "increase". The Romans usually sold in this way the goods taken in war. In England in
the eighteenth and nineteenth centuries, goods were often sold "by the candle", a short candle was lit by
the auctioneer, and bids could be made while it stayed alight.
3._____
     Practically all goods whose qualities vary are sold by auction. Among these are coffee skins, wool,
tea, furs, silk and wines. Auction sales are also usual for land and property. Furniture pictures, rare
books, old china and similar works of art.
4. _____
     An auction is usually advertised beforehand with full particulars often articles to be sold and where
and when they can be viewed by potential buyers. If the advertisement cannot give full details, catalogues
are printed, and each group of goods to be sold together called a "lot" is usually given a number. The
auctioneer need not begin with LOT I and continue in the order of numbers, he may wait until he notices
the fact that certain buyers are in the room and then produce the lots they are likely to be interested in.
5._____
     The auctioneer's services are paid for in the form of a percentage of the price the goods are sold for.
The auctioneer therefore has a direct interest in pushing up the bidding as high as possible. He will not
waste time by starting the bidding too low. He will also play on the opponents among his buyers and
succeed in getting a high price by encouraging two business competitors to bid against each other.
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