PPP是今后发展的的主流下列选项中（）不是PPP所提供的功能。
A、成帧的方法
B、LCP
C、IPX
D、NCP
参考答案：C
Since the villagers' houses have been damaged in the earthquake, the soldiers are helping them ______ tents
(帐篷). [ ]
A. put on
B. put off
C. put up
D. put down
羧酸衍生物水解反应难易程度为（）。
A、酸酐＞酸卤＞酯＞酰胺
B、酸卤＞酸酐＞酯＞酰胺
C、酯＞酰胺＞酸卤＞酸酐
D、酸卤＞酸酐＞酯＞酰胺
