The two digital signal types are the on-off signal and the pulse train signal.
这两类数字信号分别为通断信号和脉冲序列信号。
When a signal is delivered to a process, two types of actions are possible.
当一个信号被发送给某个进程时，可能会发生两类操作。
When a signal is delivered to a process, two types of actions are possible.
当一个信号被发送给某个进程时，可能会发生两类操作。
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