指令助记符有时叫做operation codes（操作码）或opcodes(操作码）。图1示例语句中ADD助记符表明我们想要指令执行加法运算。
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extended operation codes 延伸作业码
basic operation codes 基本操作码
grid operation codes 电网运行规程
raster operation codes 光栅操作码
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同义词： order code
以上来源于: WordNet
Raster operation codes define how GDI combines colors in output operations that involve a current brush, a possible source bitmap, and a destination bitmap.
光栅操作模式说明了GDI是如何组合输出操作中的颜色，包括当前画刷、可能的源位图和目标位图。
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