喉管式喷嘴利用高速喷射的蒸汽,使进料在进入提升管时形成强烈的()脉动喷射流与周围介质发生撞击而破碎。
A.湍流
B.滞流
C.紊流
D.稳流
参考答案:C
决定Ig型和亚型的部位
A.VL十VHB.VL+CLC.绞链区D.CHE.CL
---- Have you heard of Steven Jobs, the co-founder and CEO of Apple?
---- Yes, but it’s a pity that he has _____ for a half year..
A.died
B.been dying
C.been dead
D.death