大气稳定度
参考答案：
是指气块受任意方向振动后，返回或远离原平衡位置的趋势和程度。
— May I do the homework tomorrow?
一 No, you______. You should hand in before class tomorrow.
A. mustn't B. needn't C. couldn't
用竖式计算
9-8.01=
46+0.54+0.07=
0.25×98.7=
3.572÷0.47=
