修井用转盘的主轴承锥齿轮的润滑应加入()。
A、航空机油
B、车用机油
C、柴油机油
D、工业机油
参考答案:D
Sandy wants to buy the same football cards _____ his brother did. [ ]
A. like
B. as
C. to
D. so
试论控制层间温度有何意义?