由被开方数大于等于0，分母不等于0，可知：x≥0且x-1≠0，
解得：x的取值范围是x≥0且x≠1．
— Are there any children under the tree?
— ____________________________.[ ]
A. Yes, they are
B. Yes, they do
C. Yes, there are
简述东风EQ1090E型车用主减速器啮合印迹的调整方法。
