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[单选题]
用分度值为0.01mg的天平称出3g试样,应记录为()。
A.3.00000g
B.3.0g
C.3.00g
D.3.000g
E.3.0000g
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A.3.00000g
B.3.0g
C.3.00g
D.3.000g
E.3.0000g
A.50/1
B.1/500
C.1/100
D.1/1000
用加热法驱除水分以测定中结晶水的含量.称取试样0.2000g,已知天平称量误差为±0.1mg,试问分析结果应以几位有效数字报出?
液,以EDTA滴定,用去0.02043m01·L-1EDTA溶液17.50mL,求该石灰石中CaO的质量分数。