硬质点磨损
参考答案：
由工件材料中的杂质，材料基体组织中所含的碳化物，氮化物等硬质点以及积屑瘤的碎片等在刀具表面上擦伤，划出一条条的沟纹造成的机械磨损。
《金匮要略心典》“吐下之余，定无完气”的病机是
A．气不固津B．气随液脱C．脾胃气虚D．津停气阻
In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Microwave communication uses (1) -frequency radio waves that travel in straightline sthrough the air. Because the waves cannot (2) with the curvature of the earth, they can be (3) only over short distance. Thus, microwave is a good (4) for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of" dishes" or (5) . These can be installed on towers, highbuildings, and mountain tops.
3（）
A．transmitted
B．transformed
C．converted
D．delivered
