多项选择题

下列关于混凝土冬期施工措施的说法，正确的是（）。

A.宜采用硅酸盐水泥或普通硅酸盐水泥
B.提高水灰比
C.提高混凝土的入模温度
D.使用低流动性或干硬性混凝土
E.采用非加热养护方法时混凝土中宜掺入缓凝剂

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