确定苷键构型的方法主要有

A．酶水解

B．用Klyne经验公式进行计算

C．NMR

D．IR

E．UV

It knowledge is power,    ______Sir Francis Bacon wrote in 1579,   ______perhaps creativity ca be described as the ability to use that power.

A．what; and

B．as; then

C．which; and

D．that; then