反映硅酸盐水泥熟料溶剂矿物量大小的率值为：（）。
参考答案：SM
蓝舌病潜伏期为（）天。
A.4-7
B.4-10
C.4-15
As a recent survey states, people can hardly enjoy a clear blue sky because of the high level of PM 2.5.
A．in trouble
B．on purpose
C．as usual
D．in ruins
