That's an _____ question.[ ]
A. interesting
B. boring
C. difficult
D. relaxing
答案:A
A.I有=3/2A,Im=3A
B.I有=3A,I有=3A
C.I有= A,I有 A
D.I有3A,Im=6A
在正弦稳态电路中,电阻R消耗的平均功率P一般称为()。