铁丝在氧气中燃烧______．
铁丝在点燃的条件下生成四氧化三铁，故答案为：铁+氧气点燃四氧化三铁．
The performance of this reasonably priced digital camera is _____ in quality to that of more expensive ones.
A．beneficial
B．fundamental
C．comparable
D．competitive
患者男性，28岁，右颈部淋巴结结核。下列药物哪种对治疗无效
A．青霉素
B．链霉素
C．异烟肼
D．利福平
E．乙胺丁醇
