检验两个不合格率是否相等时，最适合的工具是（）
A、T检验
B、方差检验
C、双比率检验
D、卡方检验
参考答案：C
病历摘要：骨肉瘤患者男，21岁，右股骨下端肿痛2月余。查体：右股骨下端压痛，肿胀，可触及软组织肿块。行股骨下段正侧位片检查。
3.鉴别诊断是什么？
In the opinion of many people, body-bombers are forced to do so but ______ many of them are willing to. [ ]
A.as a matter of fact
B.as are sult
C. in matter of facts
D. in actually
