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Back-to-Back Devices：背对背装置

Back-propagation Network 倒传递网络 | Back-to-Back Devices 背对背装置 | Back-Up System 备份系统

back-to-back counter：背向计数器;加倍计数管

背向计数器;加倍计数管 back-to-back counter | 背向游离腔 back-to-back ionization chamber | 辅助安全装置 backup safety device

back-to-back angle：背靠背组合角钢

back-to-back angle&nbspT形组合角钢 | back-to-back angle 背靠背组合角钢 | backup 后备

back-wall photovoltaic cell：背壁光电伏特打电池

背对背锯齿波 back to back sawtooth wave | 背壁光电伏特打电池 back wall photovoltaic cell | 后部接线 back wire

Above one's head：超过...理解力

a cool head 冷静、不易激动 | above one's head 超过...理解力 | addle one's head 搞得头昏脑胀, 绞尽脑汁

addle one's head：搞得头昏脑胀, 绞尽脑汁

above one's head 超过...理解力 | addle one's head 搞得头昏脑胀, 绞尽脑汁 | apple head [美俚]笨 汉

at the head of the poll：在选举中获得最多选票

at the head of 居首位, 在最前头, 上方[头], 以... 为首 | at the head of the poll 在选举中获得最多选票 | bang head against 有效地抵抗

Head azimuth：磁头方位角

Head 录音机磁头,前置的,唱头 | Head azimuth 磁头方位角 | Head gap 磁头缝隙

Head azimuth：磁头方位角Pxw电子技术吧

Head 录音机磁头,前置的,唱头Pxw电子技术吧 | Head azimuth 磁头方位角Pxw电子技术吧 | Head gap 磁头缝隙Pxw电子技术吧

be off one's head：头脑发昏

head 头,首脑,才智 | be off one's head 头脑发昏 | He is off his head to make this decision. 他头脑发昏,才做出这个决定.

ureteropyelonephritis：(尿管腎盂腎炎)

ureteropyeloneostomy (尿管腎盂吻合<術>) | ureteropyelonephritis (尿管腎盂腎炎) | ureteropyeloplasty (尿管腎盂形成<術>)

Flight Simulator：飞行模拟机

flight performance飞行特性 | flight simulator飞行模拟机 | flight speed飞行速度