Continuously indicating and recording gravitometers are sometimes placed upstream with remote indicators located at the switching point.
有时将连续指示和记录的相对密度仪安装在站的上游，在站上油品切换点处设置遥测指示仪表。
Continuously indicating and recording gravitometers are sometimes placed upstream with remote indicators located at the switching point.
有时将连续指示和记录的相对密度仪安装在站的上游，在站上油品切换点处设置遥测指示仪表。
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