通信卫星的轨道可以是圆轨道,也可以是大椭圆轨道。
参考答案:对
浓硫酸烧伤后,最简单有效的现场紧急处理方法是()
A.立即送往医院
B.立即用碱性溶液中和处理
C.立即用大量清水冲洗
D.立即用布类擦干净
E.立即进行冷疗
She can’t get down to work because she was deeply _______ by the news of his death.
A.surprised
B.affected
C.harmed
D.charged