为了验证动能定理,某学习小组在实验室组装了如图的装置外, 还备有下列器材:打点计

题型:问答题

问题:

为了验证动能定理,某学习小组在实验室组装了如图的装置外,

还备有下列器材:打点计时器所用的学生电源、导线、复写纸、天平、细沙.他们称量滑块的质量为M、沙和小桶的总质量为m.当滑块连接上纸带,用细线通过滑轮挂上空的小桶时,滑块处于静止状态.要完成该实验,则:

(1)还缺少的实验器材是______.

(2)实验时为保证细线拉力等于滑块所受的合外力,首先要做的步骤是______;实验时为保证细线的拉力与沙、小桶的总重力大小基本相等,沙和小桶的总质量应满足的实验条件是______.

(3)在(2)问的基础上,让小桶带动滑块加速运动,用打点计时器记录其运动情况,在打点计时器打出的纸带上取两点,测出该两点的间距为L、打下该两点时滑块的速度大小为v1、v2(v1<v2),已知当地的重力加速度为g.写出实验要验证的动能定理表达式______(用题中所给的字母表示).

考点:实验:探究功与速度变化的关系
题型:问答题

关于静脉尿路造影摄影方法的描述,正确的是

A.腹部巨大肿瘤患者可用俯卧位

B.曝光时可让被检查者深吸气后屏住呼吸

C.对肥胖患者可以超过动脉压压迫

D.中心线对准肚脐与剑突连线的中点

E.代谢体循环慢的病人可以提前结束造影检查

题型:问答题

人民检察院对公安机关侦查活动是否合法的监督,主要是发现和纠正以下违法行为:( )。

A.伪造、隐匿、销毁、偷换或者私自涂改证据的

B.徇私舞弊、放纵、包庇犯罪分子的

C.在侦查活动中不应当撤案而撤案的

D.在侦查活动中利用职务之便谋取非法利益的

题型:问答题

氨基苷类最常见的不良反应是

A.肾毒性
B.肝脏毒性
C.变态反应
D.头痛头晕
E.耳毒性

题型:问答题


In the following passage, there are 25 blanks representing words that are missing from the context. You are to put back in each of the blanks with the missing word. Write your answers on the ANSWER SHEET. The time for this section is 25 minutes.
Compared with the immediate practical responsibility of the scientist, the (1) of the artist must seem puny. The decision which faces (2) is not one of practical action: of course he will try to throw this (3) into the scale, and that weight, if he is a writer or (4) a painter of genius, may have its effect. For the novelist—in our society the only artist who has a mass audience and at the same time effective economic control of the means of addressing (5) —the hope of some decisive influence is a reasonable (6) . For him, since he takes of all artists (7) is probably the largest portion of his culture as material, there is no (8) escape from the necessity for treating the content of his work seriously than (9) is for the social psychologist he is coming so closely to resemble. The dichotomy which people have tried to establish between artistic proficiency and (10) content is becoming unbearable to almost all sensitive minds. I doubt if it has ever been real— we might have admired Shelley as (11) if he had been indifferent to such things as war and tyranny, though I doubt it; certainly (12) he been indifferent we should never have been led by (13) .
There is no Hippocratic oath in literature, and I am not attempting to draw (14) up. As far as I am concerned, the artist is a human being writ large and his (15) are the ethics of any human being. Perhaps I can best illustrate (16) seems to me the new (17) of those duties of assertion and refusal from one writer, and I do not (18) it is without significance that this (19) projects the whole situation of choice into a scientific parable, the (20) of a pestilence: a (21) many human (22) are called to fight against, called not by any supernatural (23) but by the simple fact that the fight against a plague is (24) like a biological human (25) .

题型:问答题

违法违章处理报告审议的结论及其处理包括同意处理意见、退回补正处理。

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