To make an rpm-drop test, a tachometer is needed. 做每分鐘轉速下降試驗時(shí)，需要一個(gè)轉速表。
The measuring verification of handle automobile engine tachometer is always difficulty in the area of automobile measurement. 手持式汽車(chē)發(fā)動(dòng)機轉速表的計量檢定工作是汽車(chē)行業(yè)計量工作的一個(gè)難題。
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