Forbes magazine has named President Hu Jintao as the world's most powerful person, a move that analysts say shows global ________ of China's contribution to the world's economic recovery．

A．acknowledgement

B．commitment

C．complement

D．requirement

根据气相色谱流出曲线中色谱峰的位置，可以（）。

A.对检测器灵敏度进行评价

B.对被测物质进行定性测定

C.对色谱柱效能进行评价

D.对被测物质进行定量测定

E.对检测器的紫外线强度进行评价