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57 查看材料

A. closed
B. closing
C. close
D. has closed

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55 查看材料

A. calling on
B. calling for
C. calling off
D. calling in

患儿10岁，右股骨部疼痛3个月伴发热，血WBC总数增高，血沉快，穿刺无脓，X线片为右股骨中段呈洋葱皮样骨膜反应，ECT为血流相动脉血流灌注增强，血池相呈血管增生血供增加，有不规则超越骨皮质的强浓聚区，延迟相病灶呈“热区”，其诊断可能是()

A. 骨髓炎
B. 尤因肉瘤
C. 骨结核
D. 骨巨细胞瘤

54 查看材料

A. lost
B. had lost
C. will lose
D. would lose

53 查看材料

A. Because
Because of
C. As a result
D. Considering