修复划伤的表面。 A: Repair the surfaces that have scratches. B: Repair scratched surfaces.

What do the surfaces of the deserts look likeMany of them have surfaces of （）

1) What are primary flight control surfaces and what are the secondary control surfaces? (5分） 2) What are their postions? 3) What are their functions?

Lubrication A: is the process or technique of reducing wear between surfaces by using a lubricant between the surfaces. B: is a special liquid that performs three main functions during machining. It lubricates the cutting action, carries off the heat generated, and flushes(冲洗) the chips(切削). C: is the material being machined. It can be any material and any shape. In the machine shop it usually refers to round or flat pieces of metal ready to be machined.

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.

Intersect Surfaces对应的中文是____

The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.

32. Increasing free surfaces has the effect of raising the ____.

In order to increase the wearing resistance， the cylinder liner surfaces are sometimes （）.

A ___________ is a solid shape with six square surfaces which are all the same size.