70.腰椎间盘突出好发于腰3-5及腰5~骶1,是因为该部位
A. 椎间盘较厚
B. 韧带松弛
C. 血供差
D. 活动度大
E. 肌肉松弛
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So what makes them different? Millennials are the first generation to have always__1____ , which has transformed the way people __2____ .I can’t live without my iPhone. I just — I feel naked if I don’t __3_____ .
A 22-year-old is considered to be part of which generation?People born in the 1980s or ’90s are generally considered to be _________ .
沙丁胺醇氨基上的取代基是
A. 甲基
B. 异丙基
C. 叔丁基
D. 乙基
具有莨菪酸结构的特征定性鉴别反应是
A. 重氮化-偶合反应
B. 氯化铁试液显色反应
C. 坂口反应
D. Vitali反应