It is indicated that the precise flat Plate, hollow column and clock gauge should be selected properly to satisfy actual requirements for measuring accuracy of oil well pump liners.
Force - measuring elements employ either a cantilever beam or a column arrangement.
测力元件采用悬臂梁或柱的形式。
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An electro - pneumatic electron columnmeasuring instrument is a new type of measuring instrument combining pneumatic principle with electron magnification technique.