单项选择题

根据软开关技术发展的历程可以将软开关电路分成准谐振电路；零开关PWM电路；零转换PWM电路三类。

A．对
B．错

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A．In 1992, UN conference on Environment and Development held on Rio, publishing Rio Declaration
B．Millennium Development Goals (MDGs) includes 8 goals and 48 indicators
C．Brundtland report was released in June, 2012
D．US Withdrew from the Paris Agreement in Donald Trump presidency

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