A.聚乙烯(PE. B.玻纖氈(G) C.礦物粒(M) D.細(xì)砂(S)
A.(20±3)℃,24h B.(20±3)℃,12h C.(23±2)℃,12h D.(23±2)℃,24h
A.523 B.485 C.450 D.423