制动总泵活塞面积小于分泵活塞，使驾驶人操作力量（）
A.较小
B.较大
C.没有差别
D.一样
参考答案：A
用介词in, on, at 填空。
1. You can see much Chinese food the table.
2. We can see lots of many animals the zoo.
3. the library, we can borrow( 借) many books.
4. We can get weather information TV.
5. You can find out about sports this (CD-ROM.
6. We can find dictionaries the library.
下列属性组中的哪一个(些)是关系P的候选码 Ⅰ．(C,S) Ⅱ．(C,R) Ⅲ．(S,T) Ⅳ．(T,R) Ⅴ．(S,R)
A．只有Ⅲ
B．Ⅰ和Ⅲ
C．Ⅰ、Ⅱ和Ⅳ
D．Ⅱ、Ⅲ和Ⅴ
