DR准则反映了（）的对比关系。
A.重力和惯性力
B.惯性力和粘性力
C.重力和粘性力
D.角系数
参考答案：D
Look and write.（看图片，填空）
Mary is a nice girl. She is eight years old. She has big eyes. Mary' 1. ________ is green.
And her 2.________ are black.
请描述并分析骨干教师的成长规律
