問題詳情
49. The culture of animal cells in the laboratory was initially more of an art than a science, restrictedto cells that grew out tissues________ in sterile medium.
(A) maintained
(B) maintainer
(C) maintain
(D) maintaining
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增