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【单选题】
对轴、丝杠、齿轮、连杆等重要零件，为保证较好的综合力学性能，一般采用（ ）。A.
淬火
B.
正火
C.
退火
D.
调质
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举一反三
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【简答题】An 80-year-old man was sitting on the sofa in his house along with his 45-year-old highly educated son. Suddenly a crow(乌鸦) rested on their window. The father asked his son, “What is this?” The son re...
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