A.先開(kāi)助燃?xì)?,后關(guān)助燃?xì)?br /> B.先開(kāi)燃?xì)?,后關(guān)燃?xì)?br /> C.后開(kāi)助燃?xì)?,先關(guān)助燃?xì)?br /> D.后開(kāi)燃?xì)?,先關(guān)燃?xì)?/p>
A.峰高 B.峰寬 C.峰面積 D.半峰寬
A.直流電弧 B.低壓交流電弧 C.電感耦合等離子體 D.空心陰級(jí)燈