为确保人身安全,()处所应双接地。(A)隔离开关 (B)避雷器 (C)吸流变压器 ( 发布时间:2019-10-08 18:25 │ 来源:www.tikuol.com 题型:单项选择题 问题: 为确保人身安全,()处所应双接地。(A)隔离开关(B)避雷器(C)吸流变压器(D)站台上及人员活动频繁处的支柱
题型:单项选择题 Never before _____ in greater need of modern public transport than it is today.A. Beijing has been B. has Beijing been C. was Beijing D. Beijing was 查看答案
题型:单项选择题 45岁,男性,经理,急诊入院,自述半小时前突然感到气急、胸闷、心悸、头晕、出汗,自认为生命垂危,要求紧急处理。近1个月来这种情况发生过3次,每次持续0.5~1小时,发病间歇期一切正常,发病与饮食无明显关系。最有助于鉴别诊断的项目是()。A.追问起病诱因B.心电图C.脑电图D.血钾测定E.脑CT 查看答案