crystal l clock石英钟

crystal controlled clock晶控时钟

liquid crystal desk clock clock液晶台钟

lcd-clk-dataliquid crystal display clock data预示钟表

highly stable crystal clock高稳晶体时钟

electric c crystal clock电晶体钟

Ordinary crystal clock普通晶体时钟

crystal clock quartz clock石英钟

crystal clock o石英钟