1)rotor depth control,转轮深度控制2)rotor depth control automatic operation,转轮深度自动控制操作3)rotor depth control circuit,转轮深度控制回路4)rotor depth control manual operation,转轮深度手动控制5)rotor depth control switch,转轮深度控制开关6)rotor depth control limit switch adjustment,转轮深度控制限位开关的调节