31,29,23,(),17,13,11 A.21 B.20 C.19 D.18 发布时间:2018-04-08 12:42 │ 来源:www.tikuol.com 题型:单项选择题 问题: 31,29,23,(),17,13,11A.21B.20C.19D.18
题型:单项选择题 研究小车匀变速直线运动的实验装置如图(a)所示其中斜面倾角θ可调,打点计时器的工作频率为50Hz,纸带上计数点的间距如图(b)所示,其中每相邻两点之间还有4个记录点未画出。 ①图(b)中标出的相邻两计数点的时间间隔T= s②计数点5对应的瞬时速度大小计算式为v5= 。③为了充分利用记录数据,减小误差,小车加速度大小的计算式应为a= 查看答案
题型:单项选择题 从方框中选择适当的选项填入短文中的横线上,使短文通顺、完整。选项中有两项是多余选项。 A. because B. doctor C. terribly D. said E. so F. inG. carefully H. on I.illness J. showed K. worried L. have Mr Harris lived 1.________ a small house by himself. He was always 2. ________ about whathe ate and drank, and he never went out when the weather was cold. He was always afraid that he was getting 3. ________111, so he often went to his 4. ________, andthe doctor was getting verytired of (厌烦) him, 5. ________he had more other work to do. Then one day Mr Harris hurried into the doctor's office and told him he was sure he had a terrible 6. ________, which he had read about in the newspaper. He 7. ________the doctor the article. The doctor read it 8. ________and then said, "But, Mr Harris, people don't know when they 9. ________ this illness! And they feel just well. ,, "Oh, my goodness," 10. ________Mr Harris. "I thought so. That's just what I feel! " 查看答案
题型:单项选择题 男性,60岁,因咳嗽、痰中带血2周就医检查。痰涂片找到鳞癌细胞,而常规胸片未见明显异常。下列检查没有定位诊断价值的是()A.癌胚抗原(CEA.等癌标志物检查B.CT扫描C.鼻咽部检查D.侧位胸片或高千伏摄片E.纤维支气管镜检查 查看答案
题型:单项选择题 一般而言,血小板和凝血因子保持在什么范围即可满足凝血的需要()A.血小板>60×109/L,凝血因子不低于正常水平的30%B.血小板>70×109/L,凝血因子不低于正常水平的60%C.血小板>50×109/L,凝血因子不低于正常水平的40%D.血小板>40×109/L,凝血因子不低于正常水平的20%E.血小板>30×109/L,凝血因子不低于正常水平的50% 查看答案