在右大腿外伤后，可用来初步诊断为骨折的体征是（）。
A.局部高度肿胀和瘀斑
B.主动活动丧失
C.异常活动
D.局部压痛敏锐
E.疼痛剧烈
参考答案：C
It was only when I reread his poems recently _____ I began to appreciate their beauty. [ ]
A. until
B. that
C. then
D. so
硫酸庆大霉素的含量(效价)测定方法应采用
A．汞量法B．四氮唑比色法C．微生物检定法D．酸性染料比色法E．Kober反应比色法
