2023年中考模拟试题(LN)英语答案试卷 答案(更新中)

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书面表达One possible version:To make the West Hill more beautiful and raise our environmental awareness,we students went to plant trees on the afternoon oflast Friday.We took a bus and set off at 1:30.with shovels and buckets.On arriving there,we started to work.Some dug holes.andsome carried young trees and planted them.After thet.we began to water them We were in high spirits at first,but bit by hit,wefelt rather tired.Afer working for three hours,we remed to school,tire bu tppy,for we knew we had made a difference to ourenvironment.

12.【答案】BD【解析】物块运动到C点时有向下的加速度，速度并不是最大，A项错误：向下运动到速度最大时，设弹簧的压缩量为x,则x,+F,=mgsi6,向上运动到速度最大时，设弹簧的压缩量为x2,则kx2=mgsn0+F,可见x2>x1,B项正确：设物块与斜面间的动摩擦因数为4，根据能量守恒有mgL.sin30°=umg·5cos30,解得u=合，设物块第一次到达C点时速度大小为，则mg·21sin30°-umg·21cm30°=m2,解得u=20Z,C项错误：设弹簧第一次被压缩时5具有的最大弹性势能为E。,根据能量守恒有E。=mg·3Lsin0-mg·3Lcos0=1.2mgL,D项正确。