K3系数用于评定整个炼焦车间在遵守规定结焦时间方面的管理水平。
参考答案：对
She ought to stop _______. She has a headache because she _______ too long.
A．to work, was reading
B．to work, has read
C．working, has read
D．working, read
下列生产、生活中所熟悉的物质不都属于分散系的是
A．有色玻璃、空气、生理盐水
B．消毒酒精、84消毒液、纯牛奶
C．蒸馏水、矿泉水、盐酸
D．加碘盐、生铁、血液
