多项选择题

“精血同源”主要说明哪两脏的关

A．心
B．肾
C．脾
D．肝

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单项选择题

有一个连续时间系统，它对复指数信号的响应是，则该系统一定是LTI系统
A、正确
B、错误

单项选择题

Engagement is a term which explains ______.

A．the specific arrangement of a research activity
B．the agreement between different writers
C．the relations between reader and writer
D．the act of announcing the research process