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一九八九年高考化学试题第三题(选择题)中第27题是:体积为V毫升、密度为d克/厘米~3的溶液,含有分子量为M的溶质m克,其摩尔浓度为C摩尔/升,质量百分比浓度为W％。下列表示式中正确的是: (A)C=W×1000d/M (B)m=vd W/100 (C)W％=C×M/1000d％ (D)C=1000×m/V×M原题答案为(B)、(D)。我们取市、区重点校和一般校各一所,(分别简甲、乙、丙)每校各取30份试卷,就此题的填答情:做了统计分析。(见左下表) 左表数据表明,答题确人数乙校大大高于甲、(?)两校,但甲校单选B的人数
The 27th question in the third problem (multiple choice questions) of the 1989 chemistry test question in college entrance examination was: a solution with a volume of V ml and a density of dg/cm~3, containing m of a solute with a molecular weight of M, with a molar concentration of C mol/l, mass percent concentration W%. The correct ones in the following expressions are: (A) C=W×1000d/M (B)m=vd W/100 (C)W%=C×M/1000d% (D)C=1000×m/V× The answer to M’s original question is (B), (D). We took one city and district key schools and one general school. (Equipped with A, B, and C, respectively), each school took 30 papers and answered the questions: Statistical analysis was done. (See the table on the left below.) The data in the table on the left shows that the number of students answering the question is significantly higher than that of the two schools in A and (?), but the number of students who selected B in A school