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【单选题】
将 0.5600g 含钙试样溶解成 250mL 试液,用 0.02000mol/L 的 EDTA 溶液滴定,消耗 30.00mL ,则试样中 CaO 的含量为( )。 M (CaO)=56.08g/molA.
3.00%
B.
6.01%
C.
12.02%
D.
30.00%
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A.
创新
B.
绿色
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开放
D.
共享
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A.
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B.
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C.
I would rather work with people that like me.
D.
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A.
绿色
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共享
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B.
often
C.
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D.
never
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B.
共享
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开放
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I start making mistakes when I work really late.
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Sometimes I think I should just quit this job.
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