石膏配知母体现的是七情中的 A．相须 B．相使 C．相畏 D．相杀

Don't use words, expressions, or phrases         only to people with specific knowledge.     [ ]

A. being known              

B. having been known      

C. to be known                

D. known

已知二次函数y=-x²-2x+a的图象与x轴有且只有一个公共点．则二次函数y=-x²-2x+a图象的顶点坐标为______．

Do you like playing __小题1:_(不同的)kinds of balls? Are you­ interested in collecting balls.  I have a__小题2:__(特别的)room in my house, which is _小题3:_(满) of all kinds of balls. I have been collecting them__小题4:__（从...以来）I was seven years old. Now I have got __小题5:__(千)of them. I have run out of room to __小题6:__(贮存)them. They are all __小题7:__(围绕着)our house. By the way, I’d like to __小题8:__(创建)a Ball Collectors’ __小题9:__(俱乐部), and __小题10:__(欢迎) to join us. Click here to know more! Click here to join us now.

168.1.192/26划分3个子网，其中第一个子网能够容纳25台主机，另外两个子网分别能够容纳10台主机，请写出子网掩码、各子网网络地址及可用的IP地址段。注：请按子网序号分配网络地址。

对于特别重要的设备制造过程，项目监理机构可采取()的方式实施质量控制。

A.巡回监控 

B.定点监控 

C.设置质量控制点监控 

D.驻厂监造