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单项选择题
A.86.6W
B.50W
C.173.2W
D.100W
单项选择题
A.3200VA
B.2400VA
C.4000VA
D.5656VA
单项选择题
A.u=10sin(50πt-π/4)V
B.u=10sin(50πt+π/4)V
C.u=10sin(100πt-π/4)V
D.u=10sin(100πt+3π/4)V
单项选择题
A.1003W
B.1738W
C.2317W
D.3010W