下列胃溃疡并发症中，哪种不宜用钡餐检查（）
A.纳差、消瘦
B.幽门梗阻
C.慢性胃穿孔
D.溃疡癌变
E.活动性大出血
参考答案：E
Not until the next morning _____ how serious the situation was．
A．did she realise
B．had she realised
C．she realised
D．she had realized
拱冠梁法和多拱梁法有何不同？精度如何？适用情况呢？
