肺泡表面张力来自 A.肺泡上皮细胞 B.肺间质 C.毛细血管基膜和内皮细胞 D.肺泡 发布时间:2018-04-22 15:51 │ 来源:www.tikuol.com 题型:单项选择题 问题: 肺泡表面张力来自A.肺泡上皮细胞B.肺间质C.毛细血管基膜和内皮细胞D.肺泡表面液体层E.肺泡表面活性物质
题型:单项选择题 现有以下四种尺子:A、总长为1.5m的毫米刻度尺;B、总长为1.5m的厘米刻度软尺;C、总长为30m的厘米卷尺;D、分度值为0.05mm的游标卡尺.(1)工人师傅更换水龙头时,应选用______尺子;(2)配窗户上的玻璃时,应选用______尺子;(3)学校运动会上,进行跳远比赛测量成绩时,应选用______尺子;(4)缝纫工裁剪衣服时,应选用______尺子. 查看答案
题型:单项选择题 Directions:Write an essay of 160—200 words based on the following pie charts. In your essay, you should first describe the pie charts, then interpret its meaning, and give your comment on it.You should write neatly on ANSWER SHEET 2. (20 points) 查看答案