A.血CR、BUN正常,Ccr80~120ml/(1.73m·min) B.血CR、BUN升高,Ccr0~10ml/(1.73m·min) C.血CR、BUN升高,Ccr10~30ml/(1.73m·min) D.血CR、BUN正常,Ccr50~80ml/(1.73m·min) E.血CR、BUN升高,Ccr30~50ml/(1.73m·min)