trapezoid with meaning in Chinese

曲边梯形

Let be continuous and nonnegative on the closed interval . then the region bounded by the graph of , the - axis , the vertical lines , and is called the trapezoid with curved edge
设在区间上非负、连续，由，，以及曲线所围成的图形称为曲边梯形，其中曲线弧称为曲边。
The ideal bemf waveform of bldcm is trapezoid with 120 ! platform width . in the 120 conduction mode , the stator current is not ideal due to the stator inductance , and the torque ripple occurs
理想的永磁无刷直流电动机的反电动势的波形是120平顶的梯形波，在三相六状态120导通方式控制下，电流由于电机定子电感的存在而不是理想方波，因此产生了换相转矩脉动。