【单选题】My father seldom watches television in the evening. ________.
C.
My mother doesn’ t too
【单选题】I have seldom seen my mother——pleased with my progress as she is now
【简答题】在pH=10.0的氨性缓冲溶液中,以0.02000mol/L EDTA标准溶液滴定0.02000mol/L Mg2+或Ca2+溶液,以EBT为指示剂,计算终点误差。KCaY>KMaY,为什么滴定Ca2+比滴定Mg2+的终点误差反而要大?(lgKCaY=10.69,lgKCa—EBT=5.4 lgKMgy=8.69 lgKMg—EBI=7.0)
【简答题】Seldom___my boss in such a good mood since I came to work in this company.
【单选题】在 pH 为 10.0 的氨性缓冲溶液中,用 EDTA 滴定 Zn 2+ 至 150 %时
D.
pZn′ 与 lgK′(ZnY) 、 c(Y) 均有关
【单选题】I have seldom seen my mother ________ pleased with my progress as she is now. [ ]
【单选题】Emma seldom allowed my mother to go to parties.
【简答题】在pH=10.0的氨性缓冲溶液中,若 +[NH 3 ]=1mol·L -1