Given are real numbers, and , then the value of is (A)4 (B)6 (C)3 (D)4or6 题目和参考答案——青夏教育精英家教网—

题目内容

Given are real numbers, and , then the value of

（A）4 （B）6 （C）3 （D）4or6

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，then∠A is（　　）
（英汉词典acute angle：锐角；obtuse angle：钝角）

A、acute angle

B、right angle

C、obtues angle

D、acute angle or obtues angle

Given in the△ABC，a，b，c are three sides of the triangle，a=3，b=10 and perimeter of the triangle is multiple of 5，then the length of c is

．
（英汉小词典：side：边；perimeter：周长；multiple：倍数）

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。选项中有一项为多余选项。
A.　Goods for auction (拍卖) 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
【小题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 goods. 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.
【小题2】 ______
The ancient Roman probably invented sales by auction, and the English word comes from the Latin auction, meaning “increasing”. The Romans usually sold in this way the goods taken in war. In England in the eighteenth 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.
【小题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.
【小题4】 ______
An auction is usually advertised beforehand with full particulars of the 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 1 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.
【小题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.

Given in the △ABC,a,b,c are three sides of the triangle, a=3, b=10 and perimeter of the triangle is multiple of 5, then the length of c is 。

（英汉小词典：side：边；perimeter：周长；multiple：倍数）

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