【简答题】When the little child caught sight of the young woman_____ in white he started brawling immediately. A. dressed B. wearing C.worn D. putting on
【单选题】配制 pH≈5 的缓冲溶液,应选择下列哪组缓冲对 ( )
A.
NaH 2 PO 4 —Na 2 H PO 4 (pKa = 7.21)
B.
HAc—NaAc ( pKa = 4.75)
C.
NH 3 ∙H 2 O—NH 4 C1 ( pKa = 4.75)
D.
NaHCO 3 —Na 2 CO 3 ( pKa = l 0.25)
【单选题】以下关于病室温度的说法不正确的是
E.
新生儿及老年病人病室温度应保持在18~20℃
【单选题】在酸性溶液中与硫氰酸盐生成红色的方法可用于检查
【单选题】The child is ______ young to dress himself.