单词	compile the volume
释义	compile the volume 编书
随便看	pulse polaraulic selector pulse polarity pulse polarity selector pulse-polarity selector pulse polarization binary modulation pulse polarizer pulse polarograph pulse polarographic determination pulse polarography pulse poling pulse porch pulse position pulse-position pulse position indicator pulse position indicatorppi pulse position keying demodulator pulseposition modulation pulse position modulation pulse-position modulation pulse position modulation code pulse-position modulation opical tracker pulse position modulationppm Pulse position modulationppm pulse position modulation ppm pulse position modulation PPM