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arithmetic average difference quotient：算术均差商

分数次差商:Fractional difference quotient | 算术均差商:arithmetic average difference quotient | 共振瑞利散射:resonance Rayleigh scattering

arithmetic mean temperature difference：算术平均温度[在一顺流或逆流换热器中,两种流体在换热器两端温差的算术平均值]

arithmetic difference 算术差 | arithmetic mean temperature difference 算术平均温度[在一顺流或逆流换热器中,两种流体在换热器两端温差的算术平均值] | arithmetic progression 算术[等差]级数

arithmetic mean temperature difference：算术平均温度[在一顺流或逆流换热器中,两种流体在换热器两端

arithmetic difference 算术差 | arithmetic mean temperature difference 算术平均温度[在一顺流或逆流换热器中,两种流体在换热器两端 | arithmetic progression 算术[等差]级数

backward difference operator：反向差分运算子

反向差分法 backward difference method | 反向差分运算子 backward difference operator | 反向微分法 backward differentiation method

backward difference operator：向后差分算子

向后差分 backward difference | 向后差分算子 backward difference operator | 向后消去程序 backward elimination procedure

backward difference quotient：后向差商

backward difference operator 后向差分算子 | backward difference quotient 后向差商 | backward solution 后向解法

backward difference：后向差分

backward difference operator 后向差分算子 | backward difference 后向差分 | backward flow 回流

backward difference approximation：后向差分近似法

backward crossover 反相交 | backward difference approximation 后向差分近似法 | backward difference implicit 后向差分隐式法

central difference operator：中央差分运算子

中央差分记法 central difference notation | 中央差分运算子 central difference operator | 中央数字计算机 central digital computer

central difference：中心差分

central derivative 中心导数 | central difference 中心差分 | central difference operator 中心差分算子

steam trap valve：疏水阀

球阀 ball valve | 疏水阀 steam trap valve | 蛇管式换热器 serpentine type heat exchanger

aldermanship：市政官

aldermanry 议员 | aldermanship 市政官 | Alderney 乳牛