斗轮堆取料机的液压系统的油泵运转安全油温为()。
A.20℃
B.30℃~50℃
C.80℃~100℃
参考答案:B
He needs our help because he is a ________ man now.[ ]
A. sick
B. ill
C. illness
D. healthy
高层建筑内的商铺、写字楼和客房不可使用哪些电热器具?