The rectifier lets current flow into the battery only when A.C. surges in the direction of the arrow. 只有当交流电流沿箭头方向急冲时，整流器才允许电流流入电池组。
The numerical simulation was introduced to study the flows in a natural gas pipeline.The flow fields in a diffusive pipeline with different rectifiers were computed as examples. 首次采用数值模拟方法，以加带扩散管的管路为例，对其在加装不同整流器时的管内流场进行计算。
