DDC怎么记

one polyphase structure of fir filter is used to improve the performance of ddc.

并采用FIR滤波器的多相结构改进下变频器的性能。

pancreatic fibrosis was induced by intraperitoneal injection with diethyldithiocarbamate ( ddc 750 mg/ kg body weight) in rats.

以腹腔注射DDC（750mg/kg体重）每周2次，共6周建立胰腺纤维化动物模型，治疗组于DDC注射后2周起每日腹腔注射苦参碱（100mg/kg体重），6周后处死动物。

The design of filter which is decided by specifical instance is the difficulty and key in the DDC.

在数字下变频中，滤波器的设计是难点和关键，要根据具体的情况设计。