A.點(diǎn)燃時(shí),先開(kāi)助燃?xì)?,后開(kāi)燃?xì)?;熄滅時(shí),先關(guān)燃?xì)?,后關(guān)助燃?xì)狻?br />
B.點(diǎn)燃時(shí),先開(kāi)燃?xì)?,后開(kāi)助燃?xì)?;熄滅時(shí),先關(guān)燃?xì)?,后關(guān)助燃?xì)狻?br />
C.點(diǎn)燃時(shí),先開(kāi)助燃?xì)?,后開(kāi)燃?xì)猓幌鐣r(shí),先關(guān)助燃?xì)?,后關(guān)燃?xì)狻?br />
D.點(diǎn)燃時(shí),先開(kāi)燃?xì)?,后開(kāi)助燃?xì)?;熄滅時(shí),先關(guān)助燃?xì)猓箨P(guān)燃?xì)狻?/p>