常用的润滑剂有（）、（）和固体润滑剂。
参考答案：润滑油、润滑脂
Bill was doing a lot of physical exercise to build up his _____.
[ ]
A. ability
B. force
C. strength
D. mind
拟定公安决策备选方案有哪些步骤？具体要求是什么？
