石英音叉陀螺
quartz tuning fork
quartz tuning fork gyroscope
qrs
石英音叉谐振器
quartz tuning fork resonatcr
石英钟
quartz clock
crystal clock
quartz-crystal clock
crystal -controlled clock
石英音叉
quarty tuning fork
quartz tuning fork
piezo electric quartz fork
tuning fork
石英长石质角页岩
quartzofeldspathic hornfels