22.【答案】(1)6.700(6.698-6.702)(2分)(2)(2分))=g(L+d)(2分)【解析】(1)螺旋测微器的固定刻度为6.5mm,可动刻度为20.0×0.01mm=0.200mm,所以最终读数为6.5mm+0.200mm=6.700mm(2)b球通过光电门时,a球的速度大小即为此时b球的速度大小,即为n1=,以小球b为研究对象要验证机械能守恒定律,只要验证2m(1.)2-2()2=mg(L+d),即只要验证“(+在说差允许的范围内成立就可以验证机能守恒定律

第一节In recent years, campus security have become a hot topic. InhasSafety Education Day, I was honored to be a volunteer A raise theprimary school students'awareness of safety. I told those studentsvery things what they should never do. For an, examplethatdon't flya kite near electrical wires or play with fire-fightingequipments. While in school, never rush up and down the stairs. Inquipmentaddition, clean light tubes without any means of protection iscleaningangerously, let alone playing while cleaning. I hoped these tips willgeroushehelp they avoid dangerthem第一处:have→has【解题思路】考查主谓一致。主语campus security为单数名词词组,所以谓语动词要用单数形式第二处:n→On【解题思路】考查介词。 Safety EducationDay是具体的一天,所以应用介词on第三处:在 raise前加to【解题思路】考查非谓语动词。理解语境可知,此处动词不定式短语 to raise the primary schoolstudents' awareness of safety作目的状语第四处: what-that【解题思路】考查定语从句的引导词。先行词前有 the very修饰,所以应用that引导定语从句,what不能引导定语从句。第五处:删掉an【解题思路】考查冠词。 for example是固定搭配,意为“例如”。第六处: equipments→ equipment【解题思路】考查名词。 equipment是不可数名词,没有复数形式。第七处cean→ cleaning【解题思路】考查非谓语动词。分析句子结构可知,此处应用动名词短语作主语。第八处: dangerousⅣy→ dangerous【解题思路】考查形容词。is后面应接形容词,以与之构成系表结构。第九处: hoped-hope【解题思路】考査时态。理解语境可知,上下文讲的都是现在发生的事情,所以用一般现在时第十处: theythen【解题思路】考查代词。分析句子结构可知,此处是 help sb do sth短语,所以要用代词的宾格形式。第二节

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