题目内容

For thousands of years yoga was practiced _________.

A. all over the world
B. mainly in India
C. mainly in the West
D. mainly in the United States

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Yoga was known to the West____________.

A. more than 5,000 years ago
B. after the 1960s
C. in recent years
D. for thousands of years

Nowadays, westerners parctice __________.

A. all kinds of yoga
B. baby yoga
C. hot yoga
D. yogic meditation

当交流侧接在电网上，即交流侧接有电源时，称为（）逆变。

A. 有源
B. 无源
C. 电压型
D. 电流型

逆变电路最基本的工作原理是把直流电变成交流电，改变两组开关的切换（），即可改变输出交流电的频率。

A. 周期
B. 电流
C. 电压
D. 频率