液位计安装口(立管)安装的位置要求有哪些?
参考答案:
①液位计安装口(立管)可直接焊在油罐上,也可焊在人孔盖上;
②液位计安装口(立管)尽量靠近油罐中间,同时远离卸油口。
----Is that Jack speaking?
----Sorry, he isn’t in right now. He ________ the park with his mother.
A. have been to B. has gone to C. has been to
如图所示,用甲、乙两把刻度尺测量同一木块的长度,其测量结果分别为:甲尺测量的结果是________cm,乙测量的结果是_________cm, ___________尺测量较准确。