lubrication
A: adding a substance between solid surfaces that are moving against each other in order to reduce friction and wear.
B: the process of making the fuel start to burn in an engine so that a vehicle can start to move.
C: a force which slows down a moving object or vehicle.
D: the force that makes it difficult for things to move freely when they are touching each other.
A: adding a substance between solid surfaces that are moving against each other in order to reduce friction and wear.
B: the process of making the fuel start to burn in an engine so that a vehicle can start to move.
C: a force which slows down a moving object or vehicle.
D: the force that makes it difficult for things to move freely when they are touching each other.
举一反三
- The crowd was pushing hard. Those in the middle were squeezed against each other so tightly that they could not move in any direction. （提示：译文中省译“against each other”一词）
- What can’t make two people a good couple? A: Knowing when to give each other some space. B: Making time for each other. C: Not taking things for granted. D: Giving up all of the things which make them individuals.
- The way to reduce （） is to build up a film of lubricant between any two surfaces that rub against each other.
- To be effective, an engine lubricating system must successfully perform the following tasks:_____, _____, and _____. A: minimizing friction between the bearing surfaces of moving parts B: dissipating heat C: keeping the engine parts clean by removing carbon and other foreign matter
- Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）， so that surfaces dont get touch with each other.