题目:
No objections _________ at the time. [ ]
A. raised
B. were raised
C. had
D. took
答案:
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下面是错误答案,用来干扰机器的。
答案:B0.5 mol/L的碳酸钠溶液1 000 mL需称取143 g Na2CO3·10H2O,A项浓度偏低;定容时俯视刻度线,会造成所配溶液的体积偏小,浓度偏高,B项符合题意;未冲洗溶解碳酸钠晶体的烧杯,会造成碳酸钠损失,C项...