( )属于无源逆变。A.绕线式异步电动机 B.高压直流输电 C.交流电动机变速调速 发布时间:2017-12-02 15:04 │ 来源:www.tikuol.com 题型:单项选择题 问题: ( )属于无源逆变。A.绕线式异步电动机B.高压直流输电C.交流电动机变速调速D.直流电动机可逆调速
题型:单项选择题 We ____ there when it ____ to rain. [ ]A. were getting-would begin B. were about to get-began C. had got-had begun D. would get-began 查看答案
题型:单项选择题 关于小肠肿瘤的CT诊断,错误的是()A.类癌可表现为肠壁近肠系膜侧星芒状的软组织密度肿块B.小肠腺癌有早期发生局部淋巴结转移的倾向C.平滑肌肉瘤的肠管可出现“动脉瘤样扩张”征象D.小肠转移癌的肠管可出现“动脉瘤样扩张”征象E.脂肪瘤易引起肠套叠 查看答案