【简答题】By lubrication, reduce friction between moving parts of engine.
【单选题】下列算法中不适合解决0/1背包问题的是( )。
【单选题】By , reduce friction between moving parts of engine.
【简答题】Piston rings function as the seal between the piston and the cylinder wall and also act to reduce friction by minimizing the contact area between the piston and the cylinder wall.
【多选题】下列服务中,属于“经纪代理服务”的有( )。
【单选题】下列关于CSMA/CD描述,正确的是()。
D.
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