肺癌的早期表现是()
A.咳嗽、咳血痰
B.颈、面部水肿
C.持续性低热
D.咳嗽、咳脓痰
E.持续性胸痛
参考答案:A
解析:肺癌的早期表现是咳嗽、咳血痰。
The teacher is strict _____ every student and _____ everything he does. [ ]
A. in; with
B. on; with
C. with; in
D. with; on
鉴别α-去氧糖的反应是
A.K-K反应B.Raymond反应C.HCl-Mg粉反应D.Liebermann-Burchard反应E.Gibb反应