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在常温下采用适当的材料覆盖混凝土，并采取浇水润湿、防风防干、保温防冻等措施所进行的养护，称为自然养护，其混凝土的自然养护应符合( )等规定。
A.
浇筑完毕后的12h内对混凝土加以覆盖并保温养护
B.
干硬性混凝土应于浇筑完毕后立即进行养护
C.
当日平均气温低于10℃时，不得浇水
D.
浇水次数应能保持混凝土处于湿润状态，混凝土养护用水应与拌制用水相同
E.
混凝土强度达到1.5N/mm2前，不得在其上踩踏或安装模板及支架
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