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集散控制系统中，顺序控制系统通常集中在几个I／O过程控制站中，启动顺序控制应（）。A

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题目：

集散控制系统中，顺序控制系统通常集中在几个I／O过程控制站中，启动顺序控制应（）。

A、在操作员站上发指令；

B、根据条件自动执行；

C、定时执行；

D、A、B均可能。

答案：

参考答案：D

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A．his

B．its

C．it

D．him
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