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硫酸氢钠（NaHSO 4 ）在水溶液中可以完全电离为Na + 和HSO ，HSO 在较稀（如1 mol·L-1以下）的溶液中，可完全电离为H + 和SO 。不过，在浓度大的溶液中HSO 不能完全电离，而是与H + 、SO 共同存在于同一溶液中。 （1）硫酸氢钠（NaHSO 4 ）所属的物质类别是（ ） A．酸 B．盐 C．碱 D．氧化物 （2）NaHSO 4 溶液的pH 7。（填“＞”“＜”或“=”＝ (3)在稀NaHSO 4 溶液中加入Na 2 CO 3 溶液时，可以得到无色、无味的气体，该气体可以使澄清石灰水变浑浊。写出稀NaHSO 4 溶液与Na 2 CO 3 溶液反应的化学方程式和离子方程式。
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Many animals have poor eyesight while their sense of smell, is quite good.
B.
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C.
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D.
Dogs can see no more than shades of gray.
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【单选题】根据以下资料，回答9~12题。 Many animals have an excellent sense of smell, which they use in hunting．On the other hand, their eyesight may be poor．Dogs, for example, have poor eyesight and no color vision．They se...
A.
Many animals have poor eyesight while their sense of smell, is quite good．
B.
Dogs are color blind.
C.
The human sense of smell is not good.
D.
Dogs can see no more than shades of gray.
【简答题】在影响行业生命周期的技术进步因素中，最重要也是首先需要考虑的是（ ）。
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