维生素B2是下列哪种酶辅基的组成成分（）。
A.NAD+
B.NADP+
C.吡哆醛
D.TPP
E.FAD
参考答案：E
At the end of last month, ten primary schools ______ with the help of Project Hope.
A．had set up
B．had been set up
C．set up
D．were set up
说明WindowsNT中异步I/O操作的特点.
