is known to us is that the 2016 Olympic Games will be held in Rio de Janeiro, Brazil.

A．It

B．Which

C．As

D．What

维生素E中的特殊杂质是

A．碘量法
B．三点校正法
C．GC
D．非水滴定法
E．紫外分光光度吸收系数法()