A.由線路潛供電流大小決定B.由線路的重要性決定C.由開關(guān)動(dòng)作時(shí)間決定D.由線路長(zhǎng)短來決定
A.給故障錄波器的接點(diǎn),應(yīng)該用不帶保持的瞬時(shí)接點(diǎn)B.給微機(jī)監(jiān)控的接點(diǎn),應(yīng)該用帶保持的接點(diǎn)C.給音響的接點(diǎn),應(yīng)該用不帶保持的瞬時(shí)接點(diǎn)D.給光字牌的接點(diǎn),應(yīng)該用不帶保持的瞬時(shí)接點(diǎn)
A.8 B.16 C.32 D.64