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2個電子. 不懂的可以Hi
加熱濃縮,冷卻結晶是對溶解度隨溫度變化較大的物質來說的,當你在濃縮的時候溫度很高,物質的溶解度較高,當達到一定濃度後(一般是便面有一層晶體膜出現的時候),你只需要冷卻下來,溫度一低,溶解度變小自然就會有晶體…
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