硫酸盐含量超过0.8%的土和有机质含量超过10%的土，不宜用（）进行稳定。
A.水泥
B.石灰
C.粉煤灰
D.矿渣
参考答案：B
The look on her face suggested that she _____ it before _____.
[ ]
A. amazing, wouldn't know
B. amazed, hadn't known
C. amazing , hadn't known
D. amazed, shouldn't know
患者，男，26岁。节律性中上腹痛2年余。每次饥饿时加重，进餐后缓解，夜间常痛醒，昨日大便发黑就诊。体检：血压、脉率正常，中上腹部轻度压痛，无包块。隐血(+++)。
本病例估计出血量至少是多少（）
A.>50ml
B.100～200ml
C.500～1000ml
D.1000～1500ml
E.1500ml以上
