侧面磨光的拼缝水磨石,正面与侧面的夹角不得大于().
A.700
B.800
C.900
D.950
参考答案:C
—Would you mind if I turned on the radio and listened to some music?
—_________. In fact, I also like listening to music.
A.Yes, I would
B.No, you can’t
C.No, go ahead
D.Ok, no problem
水泥密度试验的水泥填充质量为50g,精确至0.01g。