单项选择题

一般我们将报告期水平与某一固定时期水平之间作比较，表明这种现象在较长时期内总的发展状况的分析叫作定基分析法。

A．对
B．错

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单项选择题

Which of the following statements is true about the active inverter and the passive inverter?
A、A passive inverter refers to a definition that converting DC into AC back to the grid
B、A active inverter refers to a definition that converting DC into AC to load
C、Emergency power supply converts DC into AC for lighting, and the inverter occurring in its circuit is called active inverter
D、A photovoltaic inverter converts DC into AC back to the grid, and the inverter occurring in its circuit is called active inverter

单项选择题

脊髓灰质炎必须借助实验室方法才能发观。（）

A.正确
B.错误