离心泵密封环泄露损失的漏失量大小取决于叶轮口环的直径、间隙的大小和两侧的（）。
A、结构
B、空间
C、压差
D、温度
参考答案：C
按要求改写下列句子。
1. He has seen the film, _____ _____ ? (完成反意疑问句)
2. There is little water in the cup, _____ _____ ? (完成反意疑问句)
3. They have some apples. (用Tom作主语改写句子)
_____ _____ some apples.
4. The children like ice cream. ( 改为否定句)
The children _____ _____ ice cream.
5. He doesn't have breakfast. (改为肯定句)
He_____ breakfast.
公安机关要及时向党委汇报重要的敌情、社情和治安情况。( )
