![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
1立方米的混凝土中,其各组成成分的质量比为水泥:砂:石子:水=324:646:1255:175,其砂率为()。
A.646/(324+646+1255+175)
B.(646+1255)/(324+646+1255+175)
C.646/(646+1255)
D.646/1255
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
C、646/(646+1255)
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.646/(324+646+1255+175)
B.(646+1255)/(324+646+1255+175)
C.646/(646+1255)
D.646/1255
C、646/(646+1255)
A.HL200-WL-550
B.ZZ200-LJ-550
C.HL200-LJ-550
D.HL200-LH-550