在浮选生产中浮选机的电动机电源一般是（）相电源。
A.三
B.四
C.五
D.二
参考答案：A
Look and answer.
1. How did Lily go to the library yesterday?
2. What did you do on Friday?
3. What did your father do yesterday?
4. What's the matter with you?
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