反复短时工作制的周期时间 T< 10min,工作时间tg < 4min时,导线允许电流有下述情况确定:截面小于( )A.1.5 mm2B.2.5 mm2C.4mm2D.6mm2的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一键将文档转化为在线题库手机刷
The streets are all dry. It during the night. [ ] A.can’t have rained B.mustn’t have mined C.couldn’t rain D.shouldn’t have rained