Scientists have decided to declare ____ war on AIDS in order to make ____ breakthrough in treating it.

A．a, a

B．/, a

C．a, the

D．/ , the

比旋光度测定中的影响因素有

A．温度

B．溶液浓度，光路长度

C．光源的波长

D．A+B+C

E．A+C