问题
单项选择题
有一实际电源的开路电压为30V,短路电流为10A,当它外接一个12Ω电阻时输出电流为( )A。
A.5
B.2.5
C.2
D.7.5
答案
参考答案:C
有一实际电源的开路电压为30V,短路电流为10A,当它外接一个12Ω电阻时输出电流为( )A。
A.5
B.2.5
C.2
D.7.5
参考答案:C
阅读下面5个句子,然后用方框中所给的单词或短语填空,使每个句子在结构和意义上正确。(提示:选项中有一个是多余的)
小题2:It is that some people were hurt in that. 小题3:Rich had a trip to Lushan Mountain last spring, 小题4:With the of science. We can enjoy life better. 小题5:My uncle will come back from England. I’m looking forward to him. |