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关注：1
2013-05-23 12:21
求翻译：to that form by addition of portland cement. The hydroxides of these metals are amphoteric. The term “amphoteric” means that the hydroxides are least soluble at a是什么意思？ 待解决
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to that form by addition of portland cement. The hydroxides of these metals are amphoteric. The term “amphoteric” means that the hydroxides are least soluble at a
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2013-05-23 12:21:38
此外硅酸盐水泥，形成。这些金属的氢氧化物是两性。 “两性”一词指的氢氧化物易溶于至少在
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2013-05-23 12:23:18
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