你能帮帮他们吗
精彩回答
下列运算正确的是( ) A. (﹣3)+(﹣4)=﹣3+﹣4 B. (﹣3)+(﹣4)=﹣3+4 C. (﹣3)﹣(﹣4)=﹣3+4 D. (﹣3)﹣(﹣4)=﹣3﹣4
1年前
Mr. Liu insists that the price of petrol _____ too high and that he ____ his car.
1年前
1年前
She knew the _________ (重要性) of working hard and not just to do what she enjoyed.
1年前
如图所示,敲响右边的音叉,左边完全相同的音叉也会发声,并且把泡沫塑料球弹起。根据这一现象,请写出两条相关的物理知识。
1年前