为了使光学显微镜或电子显微镜标本的反差增大，可用化学染料对它们进行染色。（）

Isabella; Is that the time?（）. I must be going now.Daniel: Would you like another coffee before you go? Isabella: No, I’m all right, thanks.Daniel: OK. I’ll just go and get your coat, then.

A．I'd like something to drink
B．It’s time to have lunch now
C．I’d no idea it was so late
D．I' m a little thirsty

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下列各项中，属于集体决策的方法的是（）。

A.头脑风暴法
B.名义小组技术
C.德尔菲技术
D.市场调查法

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