主变冷却器内油的流向是什么样？

— You________have finished your composition.

— I had meant to, but before I could, the bell rang and we had to hand in our test papers . [ ]

A. were supposed to  

B. were able to

C. had to  

D. were determined to

将某一审计对象总体划分为若干具有相似特征级次总体的过程称为（）。

A.分段

B.分部

C.分组

D.分层

第(44)和(45)题的关系代数操作基本如下的关系R和S。

若关系R和S的关系代数操作的结果如下，这是执行了

直接或间接持有上市公司已发行一定比例股份的自然人股东不得担任独立董事，该比例为( )。

A．5%以上
B．2%以上
C．3%以上
D．1%以上

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