After the new technique was introduced, the factory produced _____ tractors in 1998 as the year before. [ ]

A. as many twice 　

B. as twice as many 　

C. twice as many 　

D. twice many as

以下关于先天性心脏病人的麻醉诱导哪项不妥（）

A.非发绀性病人可采用氧化亚氮等吸入诱导

B.发绀性病人宜采用丙泊酚静注诱导

C.不配合患儿可先肌注氯胺酮诱导

D.发绀性病人可采用氯胺酮静注诱导

E.较大儿童可采用硫喷妥钠静注配合吸入诱导