后热
参考答案：
焊接后立即对焊件的全部（或局部）进行加热或保温，使其缓冷的工艺措施。
按首字母提示或句子意思完成下列句子。
1. What's your favorite c________? Fuzhou.
2. Listen! The students are s________ a song in the room.
3. We can borrow (借) books at the l________.
4. Tuesday is the ________ day of a week.
5. I'm ________. Let's go and buy some food.
6. Mrs Green is a nurse. She works at a ________.
以下不属于改变转差率调速方法的是()。
A．改变极对数
B．定子调压调速
C．串极调速
D．转子串电阻调速
