We have reached a point ______ a change 发布时间:2017-06-02 02:50 │ 来源:www.tikuol.com 题型:选择题 问题: We have reached a point ______ a change is needed. [ ]A. when B. with which C. why D. where
题型:选择题 Everyone stood up______ the hero came into the lecture hall.A.whileB.instantC.every timeD.immediately 查看答案
题型:选择题 下列关于干式自动喷水灭火系统的说法中,错误的是()。A.在准工作状态下,由稳压系统维持干式报警阀入口前管道内的充水压力B.在准工作状态下,干式报警阀出口后的配水管道内应充满有压气体C.当发生火灾后,干式报警阀开启,压力开关动作后管网开始排气充水D.当发生火灾后,配水管道排气充水后,开启的喷头开始喷水 查看答案