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单选题
Apparent time is based on（）.
A
a fictitious sun moving along the celestial equator
B
the visible sun moving along the ecliptic
C
the Moon's motion in relation to the Sun
D
the movement of the first point of Aries
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考题
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考题
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考题
单选题Sidereal time is used by navigators when（）.A
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考题
单选题A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）A
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考题
单选题（）, the following possible causes should be investigated.A
Should the engine stop without apparent reasonB
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Create a new Time dimension based on the Holiday table. Use derived columns for the month and the year.B
Create a Server Time dimension. Within this dimension， enable the time periods year， month， and date. Select the Additional Manufacturing calendar option.C
Create a new Time dimension based on the date values within the ProductOrderStatus table. Flag those days on which no orders were received as Holiday.D
Create a new Time dimension based on a data source view named query. Derive the data for this data source view from unique dates within the ProductOrderStatus table. Use a subquery to identify the holidays and derived columns for the month and the year.
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单选题The approximate positions of the stars are based on sidereal time，which is based upon rotation of the Earth relative to（）.A
winter solsticeB
autumnal equinoxC
summer solsticeD
vernal equinox
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