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precast prestressed hollow floor slab
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precast prestressed hollow floor slab
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工学
装配式建筑生产
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precast prestressed hollow floor slab
预制预应力空心楼板
以预应力钢绞线、高标号水泥和砂石为主要原料,采用先张法、长线叠加生产,提前在工厂预制而成的楼板。
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pesticide pollution prevention and control law
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pest molecular regulation technique
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pest- or disease- free areas
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