电机和泵的滚珠轴承常用润滑脂是2#和3#极压复合锂基润滑脂。
参考答案：对
I think the snow will make _____ difficult for us _____ the way back home. [ ]
A. that; to find
B. it; to find
C. that; find
D. it; find
下列方剂何者最宜：
A．五磨饮子
B．导痰汤
C．四味回阳饮
D．人参养荣汤
E．通瘀煎
