单项选择题

A、1
B、2
C、0
D、1或2

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问答题

采用过程时滞τ和过程惯性时间常数T之比τ T衡量过程时滞的影响。当过程的τ T0.5时，称该过程是具有（）的过程。 ‌

问答题

We said to her, They're walking through the street now.” We told her that ___ through the street ___. A、we were walking … then B、you are walking … now C、they were walking … then D、they walking … now

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