维生素E的适宜摄入量(AI值)是()。 ["14mgβ-TE/d","14mgα-TE/d","1400mgα-TE/d","140mgα-TE/d","140mgβ-TE/d"]
脂肪变性指的是()。 ["进入脂肪细胞的脂肪过多","脂肪内出现了脂肪滴","正常不见或仅见少量脂滴的细胞质出现脂滴或脂滴增多","组织内出现了脂肪细胞","脂肪组织中脂肪增多"]
传染病的流行依赖于哪些环节的连接和延续,任何一个环节的变化都可能影响传染病的流行和消长() ["A、传染源、传播途径和易感者","B、传染源、传播时间和易感者","C、病人、传播途径和易感者","D、病原体、传染性和季节性"]
食管腺位于食管的()。 ["黏膜固有层","黏膜下层","肌层","外膜","黏膜上皮"]
下列哪种元素不是致癌物质?() ["氡","镭","铀","金","钴"]
强迫油循环的冷却系统必须与两个相互独立的电源,并装有()。