9. The period of incomplete darkness when the upper limb of the sun is below the visible horizon, and the center of the sun is not more than 6° below the celestial horizon. It is: (A) Civil twilight(B) Nautical twilight(C) Astronomical twilight(D) Global Horizon twilight

9. The period of incomplete darkness when the upper limb of the sun is below the visible horizon, and the center of the sun is not more than 6° below the celestial horizon. It is:
(A) Civil twilight
(B) Nautical twilight
(C) Astronomical twilight
(D) Global Horizon twilight

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統計： A(433), B(101), C(62), D(78), E(0) #2999683

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豆子

B2 · 2024/02/07

#6025229

(A) Civil twilight 民...

(共 148 字，隱藏中）

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野區騎士(已上岸

B1 · 2024/02/07

#6024993

當太陽上緣低於可見地平線，而太陽中心低於...

(共 75 字，隱藏中）

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8. All persons who are assigned duty as officer in charge of a watch or as a rating forming part of a watch and those whose duties involve designated safety, prevention of pollution and security duties shall be provided with a rest period of not less than: a minimum of 10 hours of rest in any 24-hour period； and ____ hours in any 7-day period. The hours of rest may be divided into no more than two periods, one of which shall be at least 6 hours in length, and the intervals between consecutive periods of rest shall not exceed 14 hours. Parties may allow exceptions from the required hours of rest in paragraphs mentioned above provided that the rest period is not less than 70 hours in any 7-day period. (A) 11 (B) 10 (C) 70 (D) 77

9. The period of incomplete darkness when the upper limb of the sun is below the visible horizon, and the center of the sun is not more than 6° below the celestial horizon. It is:
(A) Civil twilight
(B) Nautical twilight
(C) Astronomical twilight
(D) Global Horizon twilight

詳解 (共 2 筆)

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