单项选择题

（章）10.2.1.6
B、0.8∠-83.66°A
A、1.104∠-83.66°A
D、0.8∠-56.66°A
C、1.104∠-56.66°A

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多项选择题

Continuous time signal is composed of several signal with frequency 300Hz,500Hz,1.2kHz, 2.15kHz and 3.5kHz,
sample this signal at a sampling rate 3kHz, the sampled sequence passes through an ideal low-pass filter with
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