问题
单项选择题
正火是将钢材加热保温后冷却的金属热处理工艺,其冷却是在( )。
A.油液中
B.盐水中
C.空气中
D.水中
答案
参考答案:C
正火是将钢材加热保温后冷却的金属热处理工艺,其冷却是在( )。
A.油液中
B.盐水中
C.空气中
D.水中
参考答案:C
用方框中所给单词或词组的适当形式填空,每个词只能用一次。 | |
2. If you put your heart into your study, I'm sure your dream will ___________. 3. December is the ___________ month of the year. 4. There were many ___________ in Chinese history, we should learn from them. 5. I find watching English movies boring because the people speak too ___________. |