Two-EC双变量误差修正twonum.二；两个Two-element array of unilateral directivity单向性二元阵Two-grade helical cylindrical gear reductor二级斜齿圆柱齿轮减速器two-head helical-scan video tape recorder双磁头螺旋扫描磁带录像机Two-step continuity RK-Rosenbrock methods两步连续RK-Rosenbrock方法TWO GEOMETRIC CHARACTERISTICS OF QUASICIRCLES拟圆周的两个几何性质two-horizontal-reel mounted potato digger双水平转轮悬挂式马铃薯挖掘机two-dimensional transient temperature field二维非稳态温度场two-dimension discrete small wave transform二维离散小波变换two-order oscillating evolutionary equation二阶振荡进化方程two dimensional ultrasonic vibration grinding二维超声振动磨削