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最佳答案:心满意足
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最佳答案:标准的解释是石头的成分中含CaCO3,空气中含CO2,它们会发生反应:CaCO3 +CO2 +H2O==Ca(HCO3)2生成溶于水的Ca(HCO3)2 .从而
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最佳答案:老师对我们说,今天我们的作业很认真,他(她)十分满意.
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最佳答案:Whenever I ask her questions, she is always ready to help and her explanations a
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最佳答案:When I asked towards him,he is always very responsive,and what he explains makes
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最佳答案:The products of your company quality is very good,and we are for your company is