()通信规约是循环式规约。A.IEC60870-5-104 B.IEC60870-5 发布时间:2019-12-23 01:33 │ 来源:www.tikuol.com 题型:单项选择题 问题: ()通信规约是循环式规约。A.IEC60870-5-104B.IEC60870-5-103C.IEC60870-5-101D.CDT
题型:单项选择题 某1FC5356发电机输出空载电压低于400V,若电压特性符合发电机空载特性曲线并且断开AVR连接后电压在432~456V间,一般可能会损坏的是()。A.限流电阻R短路B.限流电阻R开路C.V1损坏D.L1匝间短路 查看答案
题型:单项选择题 It was very kind of you to do the washing up, but you _______ it.A.mustn't have doneB.wouldn't have doneC.mightn't have doneD.didn't have to do 查看答案
题型:单项选择题 在疫情分析中,计算辖区报告发病数与去年相比上升或下降的百分比,下列哪个计算是正确的()A、(本期发病数-去年同期发病数)/去年同期发病数×100%;B、(去年同期发病数/本期发病数)×100%;C、(本期发病数/去年同期发病数)×100%;D、(本期发病数-去年同期发病数)/本期发病数×100%。 查看答案