下列描述的微生物特征中正确的是()
A.分布广泛
B.体积微小
C.种类繁多
D.需借助光学显微镜或电子显微镜观察
E.只能在活细胞内生长繁殖
参考答案:A, B, C, D
She would go and inform him if she______his address.
A.know
B.had known
C.knew
D.would have known
下列不属于食管癌的X线征象的是()。
A.不规则的充盈缺损
B.粘膜增粗迂曲呈蚯蚓状
C.不规则的龛影
D.管腔不规则狭窄
E.局部管壁僵硬不能扩张