光伏电池(组件)输出功率达到最大的点,称为最大功率点,该点所对应的电压,称为()。
A、最大功率点电压Um
B、最大功率点电流Im
C、最大功率Pm
D、开路电压UOC
参考答案:A
The old lady insisted that her daughter ____ still alive and that she ____ at once.
A.was; was operated
B.was; be operated
C.should be; should be operated
D.be; should be operated
牙轮钻头破碎岩石的最佳状态是()破碎。