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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 solstice
B
autumnal equinox
C
summer solstice
D
vernal equinox
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考题
According to the third paragraph, researchers differed from each other in the problem of_____A. whether nuclear reaction would occur.
B. whether the stars would increase its density and temperature.
C. whether shock waves would occur.
D. whether the uneven forces would flatten the stars.
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单选题Vessels approaching from west will（）pilot in approximate position 015108N/1033008E.A
obtainB
selectC
requestD
pick up
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单选题Salaries for temporary positions seem to be higher than （）.A
that of permanentB
permanentC
that permanentD
those for permanent
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单选题3.From the third paragraph, we learn that the youth _____.A
tend to mourn the pop stars who died of overdose as role modelsB
are shocked to know even pop stars may abuse drugsC
try to face the deadly effect of drug useD
may stop abusing drugs
考题
单选题Sidereal time is NOT used（）.A
as the basis for star chartsB
to enter a star finderC
in sight reduction using Pub 249D
in sight reductions of planet observations
考题
单选题Sidereal time is used by navigators when（）.A
used with the equation of timeB
used in the form of LHA AriesC
calculating the time of moonriseD
determining local apparent time
考题
单选题Where does the look-out man stand?（）.A
In positions in which the noises in the ship are least likely to interfere with the hearing of a fog signal and the man can see clearlyB
In positions in which the noises in the ship are much likely to interfere with the hearing of a fog signalC
In positions in which the hearing of a signal is reduced to a minimumD
In a position in which the man can see clearly
考题
单选题The positions and characteristics of lights and buoys shown within the port area are（）.A
untrueB
impossibleC
suspectfulD
unimportant
考题
单选题A large group of stars revolving around a center is known as a（）.A
clusterB
showerC
constellationD
galaxy
考题
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
考题
单选题A sidereal day is shorter than a solar day. This difference is due to（）.A
irregularities in the daily rotational rate of the SunB
the space motion of the solar systemC
the precession of the equinoxesD
the use of different reference points
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