A.空格鍵B.退格鍵C.回車(chē)鍵D.向下鍵
A.DEL鍵B.INSERT鍵C.空格鍵D.退格鍵
A.打開(kāi)NUMLOCK開(kāi)關(guān)B.打開(kāi)CAPS LOCK開(kāi)關(guān)C.打開(kāi)SCROLL LOCK開(kāi)關(guān)D.按INSERT鍵