水泥现场取样后，应充分混合并通过0.9mm方孔筛，均分为试验样和封存样。（）
参考答案：对
My uncle called and asked me if I had the birthday gilt from him.
A．invented
B．raised
C．received
D．ordered
反映总肺泡通气量变化的最佳指标是（）
A.潮气量
B.pH
C.A-aDO2
D.PaO2
E.PaCO2
