【单选题】可分泌表面活性物质降低肺泡表面张力的是哪种肺泡上皮细胞( )
【简答题】Man has a blood tie with nature and nobody can live outside nature. Nature provides us with everything we need: the air we breathe, the water we drink, and the food we eat. For quite a long time after...
【单选题】下列叙述中,正确的是( )
A.
字长为16位表示这台计算机最大能计算一个16位的十进制数
B.
字长为16位表示这笞计算机的CPU一次能处理16位二进制数
【简答题】Cloze Complete the following passage with words chosen from this unit. The initial letter of each is given. Man has a blood tie with nature and nobody can live outside nature. Nature provides us with ...
【单选题】男性,30岁。于8月2日突发寒战,高热,体温39~40℃,剧烈胸痛,呼吸急促,咳嗽,血性泡沫痰。查体:两肺可闻及散在湿性啰音,胸片呈支气管肺炎改变。病人于发病前1周曾到过云南西部狩猎。本病的传染源包括()
【单选题】肺泡结构中一类细胞能分泌用于降低肺泡表面张力的表面活性物质,该细胞是( )