龙卷涡旋特征(TVS)定义有三种指标:()、垂直方向伸展厚度、持续性。
A.强度
B.速度
C.切变
参考答案:C
There are few _____ in the fridge. Let's go and buy some potatoes, carrots and peppers. [ ]
A. eggs
B. meat
C. vegetables
D. fruit
计划经济条件下政府对经济主要采取直接调控;市场经济条件下政府对经济主要采取间接调控。