不定项选择

计数器是计时钟脉冲的个数，这个说法是否正确？

A．错误
B．正确

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单项选择题

根据不同级别的突发公共事件，将会相应采取不同的应急预案进行应付，下列说法正确的是（）。 A.
I级特别严重，用黄色表示 B.
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III较重，用紫色表示 D.
IV一般，用蓝色表示