函数f（x）=lg（2cosx-1）的定义域为______．

句型转换。

1. I think they will come tonight. (改为否定句)

    I _____ think they _____ come tonight.

2. I have also been to Shanghai. (改为否定句)

    I _____ been to Shanghai, _____ .

3. He did his homework last night.(改为一般疑问句)

    _____ he_____ his homework last night?

4. It's very delicious food.(改为感叹句)

    _____ _____ the food is !

5. My mother will come home in three days. (对划线部分提问)

    _____ _____ will your mother come home?

应用系统设计包括______和数据库设计。

A．数据设计

B．软件平台设计

C．硬件平台设计

D．网络结构设计

房地产市场按市场交易形式细分时，新建成的房地产产品交易不包括( )子市场。

A．租赁

B．销售

C．保险

D．抵押

慢性颌骨骨髓炎常有面部瘘管形成，并长期排脓或排出小块死骨块，例外的有

A．中央性颌骨骨髓炎

B．溶解性边缘性颌骨骨髓炎

C．放射性颌骨骨髓炎

D．增生性边缘性颌骨骨髓炎

E．婴幼儿上颌骨骨髓炎