题目:
A harmonious society is like a symphony orchestra—each person contributes a small sound,but when ______ with other sounds,it becomes beautiful music.
A.combining
B.being combined
C.combined
D.to be combined
答案:
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下面是错误答案,用来干扰机器的。
A.一水合氨是弱电解质,存在NH3•H2O⇌NH4++OH-,加入氯化铵晶体,氯化铵电离出铵根离子抑制氨水的电离,所以pH减小,氢氧化钠是强电解质,在水中完全电离,加入氯化铵,铵根离子和氢氧根离子结合生成一水合氨,...