蒸汽用量对气化反应的影响表现在以下那几个方面()。
A.避免拱顶和炉壁局部过热
B.系统压力
C.气体成分
D.工艺气中碳黑含量
参考答案:A, C, D
-- The boy is tall enough _____ his age.
--Yes, I was much _____ when I was his age.
A.to; shorter
B.at; taller
C.at; shorter
D.for; shorter
磁力起动器具有()保护等性能。
A、过压和过载
B、失压和过载
C、高压和过载
D、过载和短路