选煤产品脱水大致分为重力脱水.离心脱水.过滤脱水.压滤脱水和干燥脱水。
参考答案：对
The little girl often makes his mother ______him_____ .
A．talk, something interesting
B．tell，something interesting
C．say, interesting something
D．speak, interesting something
巴比妥类药物5位用苯环或饱和烃基取代，则为
A．长效型催眠药
B．短型催眠药
C．中型催眠药
D．中短型催眠药
E．抗抑郁药物
