冲洗锅炉水位计后进行叫水操作,水位升至水位计顶部,开启通气阀后水位消失,这时应加大给 发布时间:2017-11-19 17:41 │ 来源:www.tikuol.com 题型:判断题 问题: 冲洗锅炉水位计后进行叫水操作,水位升至水位计顶部,开启通气阀后水位消失,这时应加大给水量,迅速回复正常水位。
题型:判断题 — Do you know the reason ________ pilots turn off the plane's lights before taking off?— The practice is for the passengers to adjust to the dark ________ an emergency. [ ]A. why; for fear that B. for which; in case of C. how; for fear of D. that; in case 查看答案