关于后浇带的设置和处理，下列说法正确的是()。

A.若设计无要求，后浇带应至少保留14天后再浇筑

B.若设计无要求，后浇带应至少保留28天后再浇筑

C.填充后浇带，可采用微膨胀混凝土，强度等级与原结构强度相同即可

D.填充后浇带，可采用微膨胀混凝土，强度等级比原结构强度提高一级

E.后浇带接缝处按施工缝的要求处理

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