在选煤厂，煤的脱水是根据产品性质（主要是粒度）和所需求的水分阶段进行的。
参考答案：对
四妙勇安汤主治证机是 （）
A．血分毒热
B．热在气分
C．热毒血瘀
D．气血两燔
E．阴寒毒盛
—I'm doing a survey. Could you tell me ______?
—Sure. I usually go to work at 7:00 am.
A．why you go to work
B．how you go to work
C．when you go to work
D．who you go to work with
