将物体由地面竖直上抛,如果不计空气阻力,物体能够达到的最大高度为H,当物体在上升

题型:不定项选择

问题:

将物体由地面竖直上抛,如果不计空气阻力,物体能够达到的最大高度为H,当物体在上升过程中某一位置,它的动能是重力势能的2倍,则这一位置高度为(取抛出点所在水平面为零重力势能面)[ ]

A.

B.

C.

D.

考点:机械能守恒定律
题型:不定项选择
—Do you often go fishing with your father?
—No, _______.  I don't like fishing at all.

A. never
B. always
C. usually
题型:不定项选择

如果客户是用承兑汇票缴费,则销帐的形式为()。

A.现金

B.进帐单

C.支票

D.汇票

题型:不定项选择

量块是机械制造业中()的标准,系制成()六面体具有()个工作面,又叫测量面和()个非工作面。

题型:不定项选择

市场支配地位:是指经营者在相关市场内具有能够控制商品价格、数量或者其他交易条件,或者能够阻碍、影响其他经营者进入相关市场能力的市场地位。 以下说法正确的是( )。

A.某村只有一家豆腐店,该豆腐店可以自行决定豆腐的价格,因此可以认为该豆腐店具有市场支配地位

B.某市有五家实力相当的家电企业,这些企业实力强大,其他同行很难进入该市的市场,因此可以认为该市的每家家电企业都具有市场支配地位

C.某电信公司在国内占有绝大部分的市场份额,消费者不得不接受其电信业务收费的价格规定,因此可以认为该电信公司具有市场支配地位

D.某家具商城在某市很有知名度,很多市民都乐意去该家具商城买家具,而其他家具商城生意较为冷清,因此可以认为该家具商城在该市具有市场支配地位

题型:不定项选择

There is a difference between science and technology. Science is a method of answering (1) questions; technology is a method of solving practical problems. Science has to do with discovering the facts and relationships between (2) phenomena in nature and with establishing theories that (3) to organize these facts and relationships; technology has to do with tools, techniques, and (3) for applying the findings of science. Another (5) between science and technology has to do with the progress in each.

Progress in science (6) the human factor. Scientists, who seek to understand the universe and know the truth within the highest degree of (7) and certainty, cannot (8) their own or other people’s likes or dislikes or to popular ideas about the fitness of things. What scientists discover may shock or (9) people-as did Darwin’s theory of evolution. But even an unpleasant truth is (10) than likely to be useful; besides, we have the choice of refusing to believe it! But (11) so with technology; we do not have the choice of refusing to hear the sound produced by a supersonic aircraft flying overhead; we cannot refuse to breathe polluted air. (12) science, progress in technology must be measured (13) the human factor. The purpose of technology is to serve people—people (14) , not merely some people; and future generations, not merely those who presently wish to (15) advantage for themselves.

We are all familiar with the (16) use of technology. Many people blame technology itself (17) widespread pollution, resource depletion (枯竭) and even social decay in general—so much (18) the promise of technology is " (19) " That promise is a cleaner and healthier world. If wise applications of science and technology do not (20) a better world, what else will

12()

A.Without

B.Despite

C.Unlike

D.Regarding

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