相同质量的下列物质分别与等浓度的NaOH溶液反应,至体系中均无固体物质,消耗碱量最多的是 [ ]
A.Al2O3
B.Al(OH)3
C.AlC13
D.Al
答案:D
管件219*7是表示()。
A.外径*长度
B.内径*皮厚
C.外径*皮厚
They weren't a particularly good team, but they refused to give in and _____ defeat.
A.accept
B.accepted
C.accepting
D.to have accepted