Many high school students are _____ to go to college, but _____about failing the entrance examinations. A. eager… generous B. eager…keen C. anxious…eager D.eager… anxious 答案:D先用稀盐酸预处理强酸型阳离子交换树脂,使之变为HR,并用蒸馏水洗涤至中性,然后用该树脂软化100mL 含0. 001mol Mg2+的中性溶液,使Mg2+完全被树脂所交换,再用100mL蒸馏水洗涤树脂。将交换液和洗涤 液收集到一起,该混合液的pH为
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A.2.0B.2.3 C.3.0 D.7.0