The science lab being built in our school is ____________ the former one.

A．twice as big as

B．twice more bigger than

C．as twice big as

D．the twice size of

下列情况下需进行外科手消毒的是（）

A.与患者长时间密切接触后

B.接触患者血液、体液和分泌物之后

C.实施静脉输液之前

D.接生或助产之前

E.为乙肝患者换药之后