玉米的叶肉细胞内具有两层膜结构的是[ ] A．核糖体、叶绿体和高尔基体 B．线粒 发布时间：2017-04-24 17:31 │ 来源：www.tikuol.com 题型：选择题 问题： 玉米的叶肉细胞内具有两层膜结构的是[ ]A．核糖体、叶绿体和高尔基体B．线粒体、叶绿体和细胞核 C．内质网、高尔基体和中心体D．叶绿体、细胞壁和细胞膜
题型：选择题 Modem cowboy seem to be giving up the bandanna (印花大手帕) handkerchief; yet there was a time when this article was almost as necessary to a cowboy’s equipment as a rope, and it served for purposes almost as varied. The bandanna made a good sling for a broken arm; it made a good bandage for a blood wound. Early Irish settlers on the Nueces River used to believe that a bandanna handkerchief that had been worn by a drowned man would, if cast into a stream above the sunken body, float until it came over the body and then sink, thus locating the body. Many a cowboy out on the lonely plains has been buried with a clean bandanna spread over his face to keep the dirt, or the coarse blanket on which the dirt was poured, from touching him. The bandanna has been used to hang men. Rustlers used to "wave" strangers around with it as a warning against nearer approach, though the hat was more commonly used for signaling. Like the Mexican sombrero (阔边帽) or the fourgallon Stetson, the bandanna could not be made too large. When the cowboys of the Old West make their final parade on the grassy shores of Paradise, the guidon (旗手) that leads them should be a bandanna handkerchief. It deserves to be called the "flag of the range country".A Stetson is a ______.A．large bandannaB．Mexican sombreroC．tough vaqueroD．wide-brimmed hat 查看答案
题型：选择题 患者男性，30岁，二天前左胸被自行车把撞伤，拍片见左7，8肋骨骨折，余未见异常，今日上午下楼梯突然腹痛，面色苍白，急送医院，查BP50/30mmHg，P140次/分，弥漫性腹膜炎，腹穿抽出1ml不凝血，诊断A．上消化道出血B．外伤后腹膜后血肿破裂C．迟发性脾破裂D．虚脱E．肝被膜下血肿破裂 查看答案
