先断后接式

make or break make and break shock make and break make a break of make system diskette make system disk break system make break shovel break stock break down make-and-break ignition system break-before-make contacts make and-break mechanism break-make ratio break-make contact make-before-break contact make-and-break terminal make-and-break contact make-before-break switch make-and-break device break-before-make