2022九年级英语周报第3期答案

据前面的内容可知,作者认为自已已经(alcd矩文改sA2.thie6xwho64.wthd6s.too6.bony67.abTomb sweeping Day one of the most important Chinese traditional festival. According to ancientres A forbidden on that day and people had to cat cold food withour lighting a fireThere are several activities people do during the festival. Planting trees is a good one. Every year, muchmanywereces are planted all over China. Another popular activity is spring outing, which is a good chance to do exercise.The wether is warmly and it is pleasant to walk in the fields in the. springEvery year.inelebrate of the festival, our school organizedganizes the students to climb mountains. We alwayscelebrationng English. It

20.AD【解析】分析小球经过a、c两点的受力情况可知,合力相同F合= incAs30°,所以加速度相同,a=√3gcos30=28,故A项正确,C项错误;在a、d点,弹簧均处于原长状态,由机械能守恒定律知从a点到d点过程中减少的重力势能转化为了动能,所以在d点时的速度较大,故B项错误;由a点到b点过程由机械能守恒定律得E,= Ing30√3mgl,故D项正确。

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