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单项选择题
A.50sin(ωt-90°)
B.2sin(ωt+120°)
C.50sin(ωt+90°)
D.2sin(ωt-120°)
单项选择题
A.5sin(ωt-36.9°)
B.5sin(ωt-53.1°)
C.-5sin(ωt+53.1°)
D.-5sin(ωt-36.9°)
单项选择题
A.32e-2t+21e-3t)
B.8e-2t+9e-3t)
C.-32e-2t-21e-3t)
D.-8e-2t-9e-3t)