最常见的洋地黄中毒表现是
A．头晕、头痛
B．黄视
C．恶心呕吐
D．原来规则心律变为不规则
E．原来不规则心律变为规则
参考答案：C
某温度时，测得纯水中c(H+) =2.4×10-7 mol/L，则c(OH-) 为
[ ]
A. 2.4×10-7 mol/L
B. 1. 0×10-7 mol/L
C.
D. 无法确定
He and his wife have lived together for twenty years；they are both ________that she remains his best
friend.[ ]
A. surprised
B. clever
C. excited
D. proud
