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单项选择题

电流型逆变电路不需要给开关器件反并联二极管来提供反馈无功能量的通道。
A、正确
B、错误

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多项选择题About the burden of proof，which of the following are right?

A．Burden of presenting evidence refers to the responsibility of the prosecutor and the defendant to provide evidence to prove their claims during the court hearing.
B．Mainly solves the problem of “who will prove ”,that is, whether the specific litigation subject has the obligation to provide evidence and use evidence to prove the facts of the case.
C．The burden of proof in criminal proceedings can be defined from two levels: burden of presenting evidence and duty of proof.
D．Duty of proof refers to the obligation of proof that the public and judicial organs and their staff should undertake in criminal proceedings based on the requirements of the state for their duties.

单项选择题对于离散无记忆平稳信源的N次扩展信源，其熵为扩展前信源熵的N倍。 A、正确 B、错误