某正弦电压ω=100rad/s，初相θ=30度，t=0时，u=2V，则u(t)=（ ）
A.4sin(100t＋300)V B.2sin(100t＋300)V C.sin(100t＋300)V D.1/2sin(100t＋300)V正确答案A
某正弦电压ω=100rad/s，初相θ=30度，t=0时，u=2V，则u(t)=（ ）
A.4sin(100t＋300)V B.2sin(100t＋300)V C.sin(100t＋300)V D.1/2sin(100t＋300)V正确答案A
