电源线、保护接零线、保护接地线应采用（）、（）、（）或其他可靠方法连接。 A.焊接

用所给词的正确形式填空。

Dear Jack,

     Thanks for 1______ (send) me the snow globe of the monster. I love it. In fact I think it's probably my

favorite. I've been 2______ (collect) snow globes for seven years, and now I have 226 of them. My mom

says I have to stop, because we've 3______ (run) out of room 4______ (store) them. They're all around

5______ (we) apartment. I even store them in boxes under my bed. The first one I ever got was a birthday

cake snow globe on my 6______ (seven) birthday. I 7______ (particular) love globes with animals.I have a

big one with bears in it and another one with penguins. If you know anyone who 8______ (collect) them,

please tell me. I'd like to start a snow globe 9______ (collect) club. By the way, what's your 10______

(hobby)?

                                                                                                                                    Love,

                                                                                                                                    Ellen

神舟五号宇宙飞船带植物种子上天，通过失重和放射线处理，是为了改变种子的[ ]

A．营养结构

B．遗传物质

C．抗药性

D．发芽率

流脑皮疹( )

A．斑丘疹
B．玫瑰疹
C．淤点
D．红点疹
E．荨麻疹

为什么要求继电保护装置快速动作？

下图示意“我国某山的东坡和西坡的垂直带谱”。读图，完成小题。

干旱河谷灌丛带所在的河谷终年盛行（）

A.干冷北风

B.干热南风

C.上升气流

D.下沉气流