题目内容

CrWMn钢通过（）热处理可以获得回火马氏体和碳化物。

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W18Cr4V钢通过（）热处理可以获得索氏体和碳化物。

为什么一般钳工用锯条烧红后置于空气中冷却即变软，并可进行加工；而机用锯条烧红后（约900℃）空冷，仍有高的硬度？

Compared with other types of Chinese tea, _______has the most medicinal value and the least caffeine content.

A. black tea
B. green tea
C. oolong tea
D. compressed tea

Chinese tea can be classified into five basic categories according to their different processing techniques. The five types are,, oolong tea, compressed tea, and . Some minor types are white tea and yellow tea.