下列各种盐中，与其它三种盐对应的酸不相同的是 [ ]
A．硫酸铵
B．明矾
C．纯碱
D．硫酸钠
答案：C
After a whole afternoon’s heated discussion, they finally _____ to us what had been decided.
A．told
B．declared
C．stated
D．made
某岩块测得点载荷强度指数Is（50）＝2.8MN/m2，试按《工程岩体分级标准》（GB50218—94）推荐的公式计算岩石的单轴饱和抗压强度。
