在砂石成品中如果沒有這些細砂，就會大大降低砂石成品的質(zhì)量，同時在使用過程中必須要加大水泥的使用量，這樣就在無形之中大大增加了企業(yè)的生產(chǎn)成本。強大的鐵路、高速網(wǎng)，為國家發(fā)展構(gòu)筑了起飛的跑道。
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