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问题
多项选择题
腔内治疗可用于那些肿瘤的治疗()
A.鼻咽癌
B.乳癌
C.食道癌
D.宫颈癌
E.原发性肝癌
答案
参考答案:A, C, D
选择题
— The window is dirty.
— I know. It _____ for weeks.
A. hasn't cleaned
B. didn't clean
C. wasn't cleaned
D. hasn't been cleaned
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名词解释
实验研究法
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