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【简答题】
美国的GPS系统中卫星的轨道高度约为多少千米?
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】They are football game from seven to nine last night.
A.
Were watching.
B.
Watch
C.
Watched.
D.
Are watching.
【简答题】They are playing football over there.(I see)
【简答题】为什么船舶电网不设单独的过载保护元件？这是否说明船舶电网不会出现过载？
【单选题】—Are they going to play table tennis? — . But they are going to play football. [ ]
A.
Yes, they are
B.
No, they aren't
C.
No, they don't
D.
Yes, they do
【简答题】请翻译: What are they doing? They are playing football.