传染性单核细胞增多症血象的突出变化是（） A.白细胞正常伴异型淋巴细胞 B.淋巴细胞

UFO报表的功能包括（）。

A.文件管理功能

B.格式设计功能

C.公式设计功能

D.图表功能

1919年朗缪尔提出等电子体假说：凡原子数，总电子数均相等的物质，其结构相同，性质相似，相应的物质称为等电子体，如CO和N₂，下列物质可称为等电子体是[ ]

A．H₂O和N₂O

B．CS₂和SiO₂

C．CH₄和NH₃

D．CO₂和N₂O

口语交际

根据实际情况或想象,回答下列问题.将答案写在题号下相应的横线上。

1. What is your favourite TV programme?                              

2. When do you watch it?                            

3. Do you spend much time on TV?  

4. How long do you usually spend on the programme?          

5. What do you think of the programme? 

______________________________________                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

开展干细胞研究对人类有何积极意义？

JZ-7型制动机单独制动阀手柄在全制动位，制动缸压力为（）kpa。

A、250

B、300

C、450