林先生,43岁。毕Ⅱ式胃大部术后5天,突发右上腹剧痛,伴有腹膜刺激征,应考虑() A 发布时间:2017-05-09 22:13 │ 来源:www.tikuol.com 题型:单项选择题 问题: 林先生,43岁。毕Ⅱ式胃大部术后5天,突发右上腹剧痛,伴有腹膜刺激征,应考虑()A.十二指肠残端破裂B.术后胃出血C.吻合口梗阻D.空肠输入段梗阻E.倾倒综合征
题型:单项选择题 如图所示,A为一稳压管,它的作用是保证DE两端的电压UDE恒定不变,当流过稳压管的电流在5mA和40mA之间时,UDE就稳定在10V,R2为一可变电阻,它的最小值为500Ω,最大值为无穷大(即断路).设电源电压U=20V,则当R2变化时,为使UDE稳定在10V,R1可取下列几个电阻值中的( )A.100ΩB.200ΩC.300ΩD.4000Ω 查看答案
题型:单项选择题 What does the speaker mean a. He learned a lot of experience from observing the street life. b. He learned how to take precautions against the criminals. c. He learned to be smart by the life in New York. d. He was confident as he walked through Times Square to his office every day. 查看答案