30. 若天體在水平面之上時則Zenith Distance之計算下列何者為正確?
(A) Zenith Distance= 90° +h
(B) Zenith Distance= 90°-h
(C) Zenith Distance=0° +h
(D) Zenith Distance= 0°- h

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統計: A(17), B(117), C(13), D(1), E(0) #1854921

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