A. 一级，要求在荷载标准组合下，受拉边缘不允许出现拉应力
B. 二级，要求在荷载标准组合下，受拉边缘可以出现拉应力，但拉应力值应小于混凝土的抗拉强度设计值
C. 二级，要求在荷载准永久组合下，受拉边缘不允许出现拉应力
D. 三级，允许出现裂缝，但最大裂缝宽度应满足要求
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