润滑五定的基本内容有哪些？
参考答案：
定油品、定人员、定润滑点、定注油量、定周期。
______ is known to us is that tobacco contains nicotine and other harmful products, so you should
give up smoking.?[ ]
A. As
B. It
C. What
D. Which
思考价值问题并形成一定的价值观，是人们使自己的认识活动达到（）的重要标志。
A.自省
B.自由
C.自觉
D.自律
