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请问水泵一般是什么材质的呀?

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请问水泵一般是什么材质的呀?
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一般用途的水泵用HT200,出口消防用水泵用HT300,污水处理水泵用合金铸铁或不锈钢。
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国内农业一般都是灰铁的,出口的一般都是球铁。铸钢的
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