地球同步卫星

人造地球同步卫星发射过程可简化为点火加速、离开大气层后关闭发动机自由上升和调整姿态三个阶段。

从地面上看，它相对于地球静止于赤道上空，与地球转动同步，故称地球同步卫星。在赤道上空约为36 000 km的高度上布设3颗通信卫星，可实现除两极外的全球通信。地球同步卫星常用于通信、气象、广播电视、导弹预警、数据中继等方面，以实现对同一地区的连续工作。

与我国隔海相望的国家是                    (    )

⑴____ Where are my glasses, Mum?

⑵____ Are they in your bedroom?

⑶____ Is your sister in her bedroom?

⑷____ Who's in the living room?

⑸____ What can you see in Zoom's room?

A．No，they aren't.They are in the kitchen.

B．I can see a bed，a desk and a big sofa.

C．They are on the fridge.

D．My father and my mother are in the living room.

E．Yes，she is.She is in her bed now.)