“protractor”的概念、定义、翻译、参考文献-科学参考

单词	protractor
释义	protractor [`prō´trak·tǝr] ^ENGINEERING A semicircular instrument used to construct and measure angles formed by intersecting lines of a plane; the midpoint of the diameter of the semicircle is marked and serves as the vertex of angles constructed or measured.
随便看	lichen Lichenberger figures lichen blue development center development drift development drilling development index development rock development system development tool development well Devereaux agitator devernalization deviation deviation absorption deviation card deviation factor deviation hole deviation loss deviation ratio deviation sensitivity deviation survey deviation table deviatonic stress deviatoric stress

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