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- 1在“研究影响滑动摩擦力大小因素”的实验中,做了如图所示的实验. A、为了测定摩擦力的大小,用弹簧测力计沿水平方向拉着木块在水平桌面上做_运动,摩擦力的大小可从弹簧测力计示
- 2what should you do before you have dinner?
- 3孙子今年8岁,孙子问爷爷多少岁,爷爷说你长我这么大时,我就128岁了,求爷爷今年多少岁
- 4people would rather pay large sums of money than have their life work destroyed by gangsters.
- 5{3m-2n=11 4m+3n=9的解为m=3,n=-1,则由{3(x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可知x+y=,x-y=,x=,y=
- 6Can you be my Chinese pen friend?请帮翻译一下?
- 7已知实数ab满足1/a+1/b=5/a+b,求分式b/a+a/b的值.
- 884个7分一比一个数的百分25少7.5,求这个数
- 9He studies hard.He pass the exam.(合并成一句)
- 10已知cos(a+b)=4/5,cos(a-b)=-4/5,2/3派