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下列说法正确的是

[ ]

A气体的温度升高时,分子的热运动变得剧烈,分子的平均动能增大,撞击器壁时对器壁的作用力增大,所以气体的压强一定增大

B气体体积变小时,单位体积的分子数增多,单位时间内打到器壁单位面积上的分子数增多,所以气体的压强一定增大

C压缩一定量的气体,气体的内能一定增加

D假设有一分子a只在分子力的作用下从无穷远处向固定不动的分子b运动,则当a到达受b的分子力为零处,a具有的动能一定最大

正确答案

D
1
题型: 单选题
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如图所示,电路与一绝热密闭气缸相连,Ra为电阻丝,电源有内阻,气缸内有一定质量的理想气体,电键S闭合,现将变阻器的滑动片向下移动的过程中,下列说法正确的是(  )

A气缸内气体压强减小

B气体分子平均动能减小

C气缸内气体的内能增大

D气体分子单位时间内对器壁单位面积的撞击次数减少

正确答案

C
1
题型:简答题
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Asia’s real boat-rocker is a growing China, not Japan, a senior American economist observed.
There is so much noise surrounding and emanating from the world’s miracle economy that it is becoming cacophonous. In Washington, D. C., the latest idea is that China is becoming too successful, perhaps even dangerously so: while Capitol Hill resounds with complaints of trade surpluses and currency manipulation, the Pentagon and sundry think-tanks echo to a new drumbeat of analysts worrying about China’s 12.6% annual rise in military spending and about whether it might soon have the ability to take preemptive military action to force Taiwan to rejoin it. So it may be no coincidence that for
three consecutive weekends the streets of big Chinese cities have been filled with the sounds of demonstrators marching and rocks being thrown, all seeking to send a different message: that Japan is the problem in Asia, not China, because of its wanton failure to face up to its history; and that by cosying up to Japan in security matters, America is allying with Asia’s pariah.
Deafness is not the only risk from all this noise. The pressure towards protectionism in Washington is strong, and could put in further danger not only trade with China but also the wider climate for trade liberalisation in the Doha round of the World Trade Organisation (WTO). So far words have been the main weapons used between China and Japan, but there is a chance that nationalism in either or both countries could lead the governments to strike confrontational poses over their territorial disputes in the seas that divide them, even involving their navies. And the more that nationalist positions become entrenched in both countries but especially China, the more that street protests could become stirred up, perhaps towards more violence.
All these issues are complex ones and, as is often the case in trade and in historical disputes, finding solutions is likely to be far from simple. A revaluation of the yuan, as demanded in Congress, would not rebalance trade between America and China, though it might help a little, in due course. A "sincere" apology by Japan for its wartime atrocities might also help a little, but it would not suddenly turn Asia’s natural great-power rivals into bosom buddies. For behind all the noise lies one big fact: that it is the rise of China, not the status or conduct of Japan, that poses Asia’s thorniest questions.The "the world's miracle economy" in the beginning of the second paragraph refers to()

A.Asia's real boat-rocker.
B.China's economic success.
C.Japan's economic success.
D.both China and Japan's economic success.

正确答案

B

解析

推理题。文章一开始就谈到,亚洲真正掌舵的是中国,而不是日本;第二段第二句也提到“…中国正变得太成功”,由此可推知第二段开头的“世界的奇迹经济”指的就是中国的经济成功,所以[B]项正确。[A]“亚洲真正的掌舵者”,[C]“日本的经济成功”和[D]“中国和日本的经济成功”都不是文章所要表达的内容。

1
题型: 多选题
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多选题

在用注射器验证玻意耳定律的实验中,利用p-1/V图线来验证,若根据实验数据画出的图线不是直线,而出现了如图所示的情景,则可能的原因是(  )

A下弯时可能是实验过程中温度降低了

B下弯时可能是实验过程中气体的质量减少了

C上弯时可能是实验过程中气体的压强太大了

D上弯时可能是实验过程中气体的温度太低了

正确答案

A,B
1
题型: 单选题
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单选题

封闭在气缸内一定质量的理想气体,如果保持气体体积不变,当温度降低时,以下说法正确的是

[ ]

A气体的密度减小

B气体分子的平均动能增大

C气体的压强增大

D每秒撞击单位面积器壁的气体分子数减少

正确答案

D
下一知识点 : 用分子动理论和统计观点解释气体压强
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