煤粉经济细度
参考答案：从燃烧与制粉两个方面综合考虑，使得三项损失q4+qn+qm之和为最小时所对应的煤粉细度。
选择填空。
She ______ Latin music is awful. [ ]
A．isn't think
B．can't think
C．doesn't think
