单项选择题The length of reflection time depends mainly on A、ransmission velocity of the afferent and efferent fibers B、intensity and nature of the stimulus C、number of central synapses D、sensitivity of the receptors
多项选择题拉延模具型面造型复杂,工作表面质量要求较高,在蹭光作业时需要注意,以下哪些部位是不能蹭光的( )。