2023云浮一模化学答案

2023云浮一模化学答案试卷答案,我们目前收集并整理关于2023云浮一模化学答案得系列试题及其答案，更多试题答案请关注微信公众号：趣找答案/直接访问www.qzda.com(趣找答案)

2023云浮一模化学答案试卷答案，以下是该试卷的部分内容或者是答案亦或者啥也没有

20.A根据第2段亚历山大·斯坦恩所说的话可知,研究人员刚到南极时还是很兴奋的,但之后几个月,莽莽雪域和与外界的隔离也许让他们感到无聊

21.D根据第4段第2、3句可知,宇航员在太空工作很长一段时间跟研究人员在南极工作的情景相似,这会对他们的大脑造成伤害

22.B根据画线词后面的内容可知,见陌生人或者去新的地方这样的事情会刺激大脑该区域的生长(从而使大脑得到修复),这与长期隔离使大脑该区域萎缩正好相反,由此可知该词意为“反转;改变

23.D一项研究结果发现:科学家因为长时间处在与世隔绝和颜色单调的南极洲,他们的大脑已部分萎缩

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14解:(1)PQ运动过程中的平均感应电动势E==B出(2分)通过PQ的平均电流I=E(1分)通过PQ的电荷量q=I·△t(1分)联立以上各式,代入已知数据,得q=1C。(1分)(2)PQ达到最大速度时做匀速运动,则有mg=Bld(2分)Bdv(1分)得v=4m/s。(1分)(3)根据能量守恒定律,有mgh=1man2+Q(2分)代入数据,解得Q=1.2J。(1分)

3.C解析:本题考査万有引力定律与航天。“嫦娥五号”绕月球运行受到的万有引力提供向心力,有Gm=m()(R+h),代人数据解得M=7.4X10Pk,故C项正确,

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