气血虚弱和肝肾虚损所致痛经的病机和证治有何不同

治疗血不养心引起的虚烦不眠、惊悸怔忡之证，应选用的药物是（）

A.酸枣仁、柏子仁

B.石菖蒲、远志

C.牡蛎、龙骨

D.朱砂、磁石

E.珍珠母、磁石

In the dark street ,  there wasn't a single person _____ she could turn for help. [ ]

A. that       

B. who          

C. from whom      

D. to whom

It is difficult to     ___ cheating in exams. Don't do it.     [ ]

A. get away from  

B. get away with  

C. get out of  

D. get far off

数据的完整性是指数据的正确性、有效性和______。

A．可维护性

B．独立性

C．安全性

D．相容性

窗台有什么防水措施