刚性接口水泥砂浆应选用粒径0.5~1.5mm,含泥量不大于3%的洁净砂,水泥砂浆配比为:水泥:砂=()1:2.5。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
釆取弄虚作假等手段取得注册建造师继续教育证书的,一经发现立即( )。
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