单项选择题

A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical magnetic power.
C．By good sense of light.
D．By good sense of blood.
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单项选择题
A．Acquire information from satellites more efficiently.B．To realize full coverage of area the satellite passes over.C．Building more ground observation centers.D．Compare satellites information with those from ground.
A．Acquire information from satellites more efficiently.
B．To realize full coverage of area the satellite passes over.
C．Building more ground observation centers.
D．Compare satellites information with those from ground.
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