便携式气体检测报警仪的操作过程一般不包括下列哪个阶段()。A、使用前检查 B、定期检定 发布时间:2019-02-01 20:10 │ 来源:www.tikuol.com 题型:单项选择题 问题: 便携式气体检测报警仪的操作过程一般不包括下列哪个阶段()。A、使用前检查B、定期检定C、现场检测D、关机
题型:单项选择题 _____ with his wife twice, James decided it was time that they had a heart-to-heart talk.[ ]A. Quarreling B. Quarreled C. Having quarreled D. To quarrel 查看答案
题型:单项选择题 42. You’d better start it right away ______ you forget it.A.in case ofB.unlessC.beforeD.Since 查看答案