Previous Lesson Complete and Continue  

  12-1-緊急廣播設備-應設條件、廣播分區、警報方式、啟動裝置、擴音機及操作裝置、揚聲器(10m基準、性能基準、殘響時間、吸音係數、指向係數、臨界距離)

Lesson content locked
If you're already enrolled, you'll need to login.
Enroll in Course to Unlock