不同的文献检索工具，对文献内容的揭示程度不同，按由浅到深排列，其顺序是（）；（）；（）。
参考答案：目录、题录、文摘
A．The library is in the busiest part of the city.
B．The library has grass and trees around it.
C．The roof of the Main Reading Room is 41 feet high.
D．Its rooms are very large.
比3.2多6.4的数是多少？
