一次在豪族举办的盛大宴会上，大家正在凝神聆听着那些婉转动听的乐曲，忽然有一个年轻美丽

领导、管理层、外部审计师以及内部审计师在创建适当的控制过程中起着重要作用。高层管理者的首要职责是：

A．建立和保持组织文化。
B．审核财务和经营信息的可靠性和完整性。
C．确保外部审计师和内部审计师监督风险管理和控制过程系统的管理。
D．实施和监督由董事会设计的控制。

用划线词的反义词填空。

1. Bring your math book here and _______ away your exercise books.

2. I like short hair. I don't like _______ hair.

3. My shoes are too old. I want to buy _______ ones.

4. The store sells school things. You can _______ some coloured pencils there.

5. I think this book is very easy and that book is very _______.

6. Watching TV is too boring. But playing sports is very ________.

7. His first name is John and his _______ name is Green.

8. The shirt is too big for me. Give me a _______ one, please.

9. The blackboard is black. The words on it are _______.

10. These are my shoes and _______ are yours.

中和100克溶质质量分数36.5%的盐酸，需用200克氢氧化钠溶液，反应完毕后加入28.44克氯化钠恰好形成20℃时氯化钠饱和溶液．计算：

（1）所用氢氧化钠溶液的溶质质量分数．

（2）20℃时氯化钠的溶解度．

什么是有性杂交育种？

根据无线传播理论，900MHz与1800MHz在传播特性上的差别是：（）电波绕射能力较强，（）电波穿透能力较强。