题目:
John hadn’t been able to stop smoking suddenly;he had to control his smoking desire ________.
A.by and by
B.sooner or later
C.little by little
D.from time to time
答案:
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【设计实验】(1)氢氧化钡能与硫酸钠反应生成硫酸钡白色沉淀和氢氧化钠;故答案为:Ba(OH)2【问题讨论】(1)氢氧化钡能与硫酸钠反应生成硫酸钡白色沉淀和氢氧化钠;故答案为:Na2SO4+Ba(OH)2=2NaOH+BaSO4↓...