()、被测介质及工艺管道三者之间应连接等电位,并应接地。A.10% B.12% C. 发布时间:2017-09-29 06:54 │ 来源:www.tikuol.com 题型:单项选择题 问题: ()、被测介质及工艺管道三者之间应连接等电位,并应接地。A.10%B.12%C.15%D.18%
题型:单项选择题 —I’m sorry to have kept you waiting long.—Never mind. I _____ here for only a few minutes. [ ]A. have been B. have come C. have arrived D. waited 查看答案