皮皮学，免费搜题
登录
搜题
【判断题】
随机误差项 和残差项 是一回事。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】BeiDou是 。
A.
中国自主研制开发的
B.
有源三维卫星定位与通信系统
C.
系统由空间端、地面端和用户端组成
D.
可在全球范围内全天候全天时为各类用户提供高精度、高可靠定位、导航、授时服务。
【简答题】Today, there are more than 20 Beidou satellites above our heads, and China plans to send up even more this year to expand(扩张)the Beidou network to better serve the Belt and Road Initiative. As Beidou ...
【单选题】What will make Beidou competitive with the US Global Positioning System?
A.
It is benefiting civilians and the military.
B.
It has been providing accurate and stable services.
C.
It has improved its accuracy to an error margin as low as five meters.
D.
Its accuracy can be further improved to be within centimeters.
【简答题】Tout ________ brille n'est pas or.
【简答题】Tout ce qui brille n’ est pas d’ or.
【单选题】China’s Beidou global satellite navigation system will have been completed by 2020, ________ of more than 30 satellites.
A.
consisting
B.
consisted
C.
to consist
D.
consists
相关题目：