40. The _____ means the greatest distance that a light can be seen under its nominal range
and the existing meteorological visibility.
(A) nominal range
(B) luminous range
(C) meteorological range
(D) geographic range
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統計: A(5), B(14), C(11), D(2), E(0) #3279062
統計: A(5), B(14), C(11), D(2), E(0) #3279062