Watch out! Don’t get too close to the building         walls are being painted.

A．of which

B．which

C．whose

D．that

阿司匹林红外吸收光谱中主要特征峰的波数是，羰基v_c=o（）

A．1310，1190cm^-1

B．1760，1695cm^-1

C．1610，1580cm^-1

D．3300～2300cm^-1

E．750cm^-1