简述机械常见故障机理。

根据短文内容和首字母提示，在下文空格处填入适当的词使短文完整。在答题卡标有题号的横线上，完整地写出空缺处单词的正确形式。（每空一词）

Have you ever heard of Dididache? Dididache (嘀嘀打车), a taxi-hailing smartphone app（应用程序）which is believed to be created by Tencent, has recently a 小题1:  in Xiamen, and more than 700 taxi drivers in the city have used the app.

The app s小题2:  the real-time locations of taxis on a map using the GPS technology and makes it possible for users to hail (招呼) a taxi on their smartphones. The u  小题3: request （要求）will be sent to the nearest taxi drivers who will decide w 小题4:  to accept the order or not.

Taxi-hailing apps are very p 小题5:  in Beijing, Shanghai, Hangzhou and Nanjing, having gained tens of thousands of users. H  小题6:  , the city’s taxi-control departments doubt its helpfulness and have said it may not be s 小题7: for Xiamen.

The app has been criticized (指责) for disturbing market order, and creating d 小题8:  for passengers who do not use the app to hire a taxi. Many users complain that they are only useful when most taxis are idle (空驶), and hiring a taxi can still be challenging during bad w小题9:

and rush hours. Can this app be in use for long? Technology might make a great d  小题10: to our life. Let’s wait and see.

脊髓血液供应的三个主要来源是（）。

A.脊髓前动脉，脊髓后动脉，根动脉

B.椎动脉，脊髓前动脉，脊髓后动脉

C.椎动脉，基底动脉，根动脉

D.椎动脉，冠状动脉，根动脉

E.冠状动脉，根动脉，脊髓前动脉

（）作为新风量取值标准是不严格的。

A.补偿室室内排风量

B.层流洁净室总送风量的2％～4％

C.保持室内正压值

D.室内每人每小时的新鲜空气量不小于40m³

当IS曲线和LM曲线相交于凯恩斯区域时，价格上升使得均衡支出量（）。

A.增加

B.减少

C.不变

D.不能确定

国际奥委会的主要（）就是通过复兴奥运会，发展和促进世界体育运动。

A、奋斗目标

B、工作目标

C、组织目标