骨肉瘤X线检查的影像学特征是() ["发生于骨端","短管状骨多见","可见"日光照射"现象","可为膨胀性生长","与正常组织界限清楚"]
简述电力机车齿轮轮齿的失效形式。
骨巨细胞瘤外科分级属于() ["G0T0~2M0~1","G0~1T0M0","G0~1T0~2M0~1","G2T0M1","G2T0M0"]
电力机车齿轮转动装置的大小齿轮都采用变位齿轮,其主要目的是什么?
GPS时间信号传输通道可在下列几种通道中选用?() ["同轴电缆","屏蔽双绞线","音频通信电缆","光纤"]
刮瓦的目的是什么?