17 下圖為何種功能性矯正裝置?
(A)機能矯正裝置(activator) (B)生物功能矯正器(bionator) (C)法蘭克功能性矯正裝置(Fränkel functional regulator) (D)雙咬合塊功能性矯正裝置(twin block)