重油的残碳率对燃烧有何影响?
参考答案:残碳率高时,可以提高火焰的黑度,有利于增强火焰的辐射能力;但残碳多时会在油烧嘴上积炭结焦,造成雾化不良,影响油的正常燃烧。
That trading company in Tokyo did consider()the transaction with you.
A.concluding
B.toconclude
C.conclude
D.conclusion
制作可卸代型时,常用作修整牙颈缘的工具是
A.布轮B.球形钻C.钨钢钻D.金刚砂针E.橡皮轮