A.指按鈕未被按下時(shí)處于斷開狀態(tài)的觸點(diǎn) B.指按鈕未被按下時(shí)處于閉合狀態(tài)的觸點(diǎn) C.指無論按鈕按與不按一直處于斷開的觸點(diǎn)
A.220VAC B.220VDC C.110VAC D.24VDC
A.控制器主機(jī) B.輸入模塊 C.輸出模塊 D.存儲(chǔ)器