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【多选题】
关于混凝土取样与试块留置的说法，正确的有（）。A.
用于检查结构构件混凝土强度的试件，混凝土运至施工现场后首立方内抽取
B.
当一次连续浇筑超过1000m时，同一配合比的混凝土每200m取样不得少于一次
C.
每一楼层、同一配合比的混凝土，取样不得少于一次
D.
每次取样都必须留置标准养护试件，至少一组
E.
每次取样都必须留置同条件养护试件，至少三组
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