键联结有什么功用？

既是世界上产油大国，又是进口石油最多的国家是[ ]

A．俄罗斯

B．美国

C．德国

D．沙特阿拉伯

When I was in junior high school, darkness began filling my mind. I don’t know the reason why it began. All I know is that I started f_小题1:___ hopeless and worthless. I hid in my room, staring out of the window, thinking about all my  ____小题2:(失败). I even questioned whether being 小题3:____(活着) was worthwhile. My dark mood wasn’t constant. It would fade at t____小题4:___, but it always returned.

It was my parents and my friends that helped me get  ___小题5:____ the dark mood. At the beginning when I was depressed, I was (小题6:___(尴尬) to tell anyone. I didn’t want to seem weak or needy. But later I found that when I told my friends my feelings, they never laughed at me. On the 小题7:______, they supported and encouraged me. So remember: no one can face depression a__小题8:___. If you’re depressed, find someone — a friend, parent or teacher — and tell them your feelings. Consider 小题9:__________ a doctor or psychologist, if it is getting worse.

In fact, t__小题10:___ depression affects many people all over the world, treatments are available and can bring hope and joy back into their life.

下列哪项是TIA病人常用护理诊断（）

A.躯体移动障碍

B.言语沟通障碍

C.知识缺乏

D.潜在并发症：褥疮

E.潜在并发症：肺炎

城市燃气管网根据输送压力不同分为哪四种？进入用户燃气燃烧器的燃气压力要在多少以下？

网络拓扑是通过网中结点与通信线路之间的______关系表示网络结构。