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- 1固定在支架上,不随重物的滑轮叫（ ）,它能改变（）；随着重物上下移动的滑轮叫（）,它能（）.
- 2The room that there is a machine is a workshop in这句话先行词做什么成分?
- 3已知函数f（x）=3x/(x^2+x+1) (x>0)若x1>=1,x2>=1,证明If（x1）-f（x2）
- 4已知函数f(x)=(1/3)x,函数g(x)=log1/3x
- 5如图所示,平行四边形ABCD的对角线AC,BD相交于点o,E,F是直线AC上的两点且AE=CF,求证：四边形BFDE是平行四边形.
- 6I _____ _____ home _____ my mother came back.我一直呆在家里等到妈妈回来才离开.(补充空格)
- 76.It’s nine o’clock.______ the ______?= _____ _______ is it?
- 8The man has been dead for 40 years.改同义句
- 9负数算24点 6,5,7,-8
- 10物理热水瓶大气压