After the British colonies became independent, many of them joined
A. The Democracy Federation
B. The United Kingdom
C. The Commonwealth of Nations
D. The Anti-Monarchy League
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Another name for the Church of England is
A. The Anglican church
B. The Roman Catholic church
C. the Presbyterian church
D. the Three-Self church
7.线切割机床使用照明灯的工作电压为（）。
A. 6V
B. 36V
C. 220V
D. 110V
3.数控线切割机床U、V移动工作台，是具有加工功能的电火花线切割机床的一个组成部分。
频率是声波在（）时间内完成周期性振动变化的次数。
A. 1min
B. 1s
C. 1hour
D. 1天
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