line switching的用法和樣例：
例句
- NOTE 1 The different positions of controls and switching devices are taken into account.
把控制器和開(kāi)關(guān)在置于不同位置的因素考慮在內。 - The switching reliability and long service life are guaranteed by either a silver plated or optional gold plated contact.
鍍銀的或鍍金的接點(diǎn)保證了開(kāi)關(guān)的可靠性和使用壽命。
