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【单选题】
若 BaCl2 中含有 NaCl、KCl、CaCl2 等杂质，用 H2SO4 沉淀 Ba2+ 时，生成的 BaSO4 沉淀最易吸附A.
Na+
B.
K+
C.
Ca2+
D.
H+
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A.
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B.
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C.
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D.
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A.
give
B.
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C.
circulate
D.
pump
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【单选题】设函数满足 ,并且在相同的极限过程下 存在,则 ____________。这一性质又称为极限存在的____________准则。
A.
,单调有界
B.
,夹逼
C.
不存在,夹逼
D.
都不对
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