| 单词 | differential instrument | 
| 释义 | differential instrument [´dif·ǝ`ren·chǝl `in·strǝ·mǝnt]  ENGINEERING Galvanometer or other measuring instrument having two circuits or coils, usually identical, through which currents flow in opposite directions; the difference or differential effect of these currents actuates the indicating pointer.  | 
	
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