对骨髓瘤诊断最有价值的临床化验表现是（）
A.50岁以上
B.尿中本-周蛋白
C.血清钙升高
D.进行性贫血
E.全身骨痛
参考答案：B
I would have gone to visit him in the hospital had it been at all possible, but I ________(be) fully occupied the whole of last week.
常温下，VL pH＝2的盐酸与0.2L pH＝12的氨水混合，若所得溶液显酸性，下列有关判断正确的是( )
A．V一定等于0.2
B．V大于或等于0.2
C．混合溶液中离子浓度一定满足：c(Cl－)>c(NH)> c(H＋)>c(OH－)
D．混合溶液中离子浓度一定满足：c(NH)＋c(H＋)＝ c(Cl－)＋c(OH－)
)> c(H＋)>c(OH－)