水泥的代号为P·S。
A．硅酸盐
B．普通硅酸盐
C．矿渣硅酸盐
D．火山灰质硅酸盐
参考答案：C
Let me congratulate ________ you ________ the birth of your daughter. [ ]
A. to; for
B. /; on
C. on; for
D. /; for
