在三相半控桥式整流电路带电感性负载时，α的移相范围为60°。
参考答案：错
The headmaster told the boy____ the angry teacher, but he refused to. [ ]
A. to apologize
B. apologize to
C. to apologize for
D. to apologize to
什么是激光测料面技术？其特点如何？
