艺术大师达·芬奇的代表作是（） ①《最后的晚餐》②《创世纪》③《大卫》④《蒙娜丽

按要求转换句子。

1. They run so fast. (感叹句)

    _______ _______ they run!

2. He is a very tall and thin man. (感叹句)

    _______ _______ _______ and thin man he is!

3. Jenny has long hair. (选择疑问句)

    _______ Jenny _______ long hair ______ short hair?

4. They sit under the tree every day. (用now改写句子)

    They _______ _______ under the tree now.

5. We watch TV in the room. (用she来改写句子)

     _______ _______ TV in the room.

6. Look, she's studying English over there. (用sometimes来改写句子)

    She _______ _______ English over there.

7. My pen pal comes from Canada. (复数)

    _____________________ from Canada.

8. These are their balls under the bed. (单数)

    _____________________ under the bed.

安全协作理念的内容是（）。

A、先确认，后操作

B、纠正每一个细小差错

C、确保他人安全是我的责任

D、以上全是

基础代谢率的正常值是（）

A.-4%～+4%

B.-6%～+6%

C.-10%～+10%

D.-8%～+8%

E.-12%～+12%

组织生产和流通的最佳方法是（）

A、差量分析法

B、网络分析技术

C、线性规划

D、非线性规划

简述氨压缩机出口角阀泄漏的处理方法。