在等腰△ABC中，AB＝AC，O为不同于A的一点，且OB＝OC，则直线AO与底边

You are a manager of Administrative Office named J. S. Sanford. The board of directors have decided to refurbish the offices of Financial Department. Write a memo to tell all the employees that:

1) How long will this project last

2) Where shall be the temporary offices for the Financial Department during this period’

3) Which kind of affairs might be influenced during this period, and what will be the corresponding solutions

You should write about 100 words.

如图所示，在离地高H处，小球A以速度v₁水平抛出，与此同时，地面上小球B以速度v₂竖直上抛，两球在空中相遇．则（　　）

A．从它们抛出到相遇所需的时间是H/v₂

B．它们在H/2处相遇

C．两球抛出时的水平距离为Hv₁/v₂

D．两球相遇时速度大小相同

骨关节结核最常见的发生部位，是

A．全身滑膜面积最大的膝关节

B．脊柱椎体

C．活动最多的髋关节

D．负重最大的踝关节

E．肌肉最不发达的腕关节

肾结石病人对侧肾功能良好，下列哪种情况应考虑切除患肾

A．复发性肾结石

B．肾脏多发性结石

C．鹿角状结石伴肾积水

D．患侧肾功能严重受损

E．体外冲击波碎石后输尿管形成石街

泵启动后无压力或调不上压力产生的原因（）.

A.先导阀的中、下节流孔塞堵

B.卸载阀主阀卡住或已损坏

C.推力活塞处的密封圈损坏

D.卸载阀、先导阀卡住或已损坏