全国100所名校单元测试示范卷高一语文必修一2023答案

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18.解;本题考查独立性检验(1)由题知10010a+b+25=100,解得(2)由(1)可得如下2×2列联表普查员使用手机上门入户登记通过互联网自主填报合年龄不超过40岁年龄超过40岁45合计60100k2=100×(30×45×10)280040×60×55×453~24.24>6.635,所以有99%的把握认为年龄与普查登记方式有关.2分

想起一些有意思的事情

改错部分Last Saturday the Environmental Protection Club of our school hold a clean-up project in the People'sheldPark so as to raise the environmental aware of the publie.A number of yolunteer gathered at the school gate,awarenessvolunteersbut went to the park by bike.Some of them picked up the litter,and some were put the rubbish into the dustbins.andMany visitors came to our help,showing considerable appreciation and support.That they did made the parktheirWhatmuch clean and more attractive.The project was A great suceess and the club decided to organized such activitiescleaneraorganize/organiseregularly.

【20题答案】【答案】(1)检查装置的气密性(2)分液漏斗、圆底烧瓶(3)Mn02+4HC1浓)≌MnC12+C12↑+2H20(4)①.除去Cl2中的杂质HC1气体②.干燥、防止水蒸气进入装置E(5)使C2O冷凝收集且防止Cl2O分解