双极单投开关double-pole single-throw switch【电】
单刀单掷开关single-pole single-throw switch【电】
双刀单投开关double pole single-throw switch
单投开关single-throw switch
单投开关single-throw switch【电】
三极单投刀开关triple-pole single-throw switch【电】
单极单投刀开关single-pole single-throw switch【电】
【电】 单投开关single-throw switch