刀口: 1.(刀刃) cutter point; tool edge; knife edge2.(比喻最能发挥作用的地方) where a thing can be put to best use; the crucial point; the right spot 短语和例子把劲儿使在刀口上 bring efforts to bear on the right spot3.(动手
Low - voltage high - rupturing - capacity fuses with blade contacts ; lv hrc fuse bases for lv hrc fuse links for 500 and 660 v a . c . and 440 v d . c 带刀口触点的低压高遮断容量熔断器.交流电压500v和66