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【单选题】
已知随机变量ξ服从正态分布N（2，σ 2 ），P（ξ＞4）=0.2，则P（ξ＜0）=（ ）A.
0.8
B.
0.6
C.
0.4
D.
0.2
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反馈参考答案：
举一反三
【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.
【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
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