题型:问答题 简答题 即使是密闭条件很好的仓房,都有不同程度的气体渗漏现象发生。解决方法为开环流风机的次数应不宜过多,时间不宜太长。一般施药后()开机30min~6Omin环流一次,此后再隔一定时间环流1~2次即可。A、24hB、36hC、48hD、72h时 查看答案
题型:问答题 简答题 Ten years had passed the CCTV event People Who Moved China took place in 00.A.whenB.whileC.beforeD.since 查看答案