粉体粒子的外接圆的直径称为（） A．定方向径 B．等价径 C．体积等价径 D．

阅读理解。

     Mrs Brown had a small garden behind her house and in the spring she planted some vegetables in it.

She looked after them very carefully, and when the summer came, they looked very nice.

     One evening Mrs Brown looked at her vegetables and said, "Tomorrow I am going to pick them and

we can eat them."

     But early the next morning, her son ran into the kitchen and shouted, "Mother, Mother! Come

quickly! Our neighbour's ducks are in the garden and they are eating our vegetables!"

     Mrs Brown ran out, but it was too late. All the vegetables were finished! Mrs Brown cried, and her

neighbour was very sorry, but that was the end of the vegetables.

     Then a few days before Christmas, the neighbour brought Mrs Brown a parcel. In it was a beautiful

fat duck. And on it was a piece of paper with the words, "ENJOY YOUR VEGETABLES!"

1. Mrs Brown had a _____ behind her house.

A. shed        

B. small garden        

C. an apple orchard  

D. small house

2. In _____ she planted some vegetables in the garden.

A. the summer    

B. the winter          

C. the autumn        

D. the spring

3. When _____ came, the vegetables looked very nice.

A. the summer    

B. the winter         

C. the autumn        

D. the spring

4. Early the next _____ her son ran into the kitchen and shouted.

A. morning        

B. afternoon        

C. evening        

D. night

5. One morning _____ were eating vegetables in the garden.

A. donkeys        

B. ducks            

C. pigs            

D. chickens

一般而言，套利交易面临的风险有政策风险、市场风险、操作风险和资金风险。( )

患者痰结核杆菌涂片阴性，而临床上有喘息，肺部闻及哮鸣音。关于是否应用激素下列哪种意见比较合理

A．禁忌应用激素，因为有肺结核史

B．应用支气管舒张剂，尽可能不用激素

C．选择表面激素吸入，注意肺结核的定期随访

D．应用口服激素，注意肺结核的定期随访

E．短期(1～2周)应用表面激素吸入

微机硬件系统中最核心的部件是

A．内存储器

B．输入输出设备

C．CPU

D．硬盘

哪些激素增高可引起妊娠免疫试验阳性？