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论述基本观测量，双频消电离层观测量，电离层残差观测量，宽巷观测量，窄巷观测量，相位平滑伪距观测量的观测方程，应用场合？
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【单选题】Humans on the earth have had an over-inflated view of how far the planet’s atmosphere extends into space. It turns out that the ionosphere (电离层), the layer of electrically charged particles that compr...
A.
thanks to the weak solar activity
B.
because of the advanced CINDI
C.
by chance
D.
as predicted
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【单选题】Humans on the earth have had an over-inflated view of how far the planet’s atmosphere extends into space. It turns out that the ionosphere (电离层), the layer of electrically charged particles that compr...
A.
thanks to the weak solar activity
B.
because of the advanced CINDI
C.
by chance
D.
as predicted
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