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【单选题】
水的硬度是指水中离子沉淀肥皂的能力。一般指水中 ( ) 盐类的含量。A.
钠、钾离子
B.
钙、磷离子
C.
钙、镁离子
D.
钙、氯离子
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【简答题】阅读理解。 What do people do with their old, out of date but still useful computers? Most people don't know what to do with them. Many old computers are put away in homes. Many more are simply thrown away ...
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【单选题】Some old people don' t like pop songs because they can' t ______ so much noise.
A.
resist
B.
obtain
C.
tolerate
D.
understand
【简答题】当堆栈采用顺序存储结构时,栈顶元素的值可用 表示。
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