The motion of the apparent sun is along the ecliptic
Measurement of time is along the celestial equator
The speed of the Earth's revolution is not constant
There are variations in the Earth's rotational speed
第1题：
For what purpose are the diving pipes used?
A. To absorb heat from the sun.
B. To store heat for future use.
C. To turn solar energy into heat energy.
D. To carry heat down below the surface.
第2题：
A.The system is configuring a device.
B.A system initiated dump has started.
C.The system is varyingon a volume group.
D.The system is running an inbuilt self test.
第3题：
The major difference between PERT and CPM networks is:
A.PERT requires three time estimates whereas CPM requires one time estimate.
B.PERT is used for construction projects whereas CPM is used for R & D.
C.PERT addresses only time whereas CPM also includes cost and resource availability.
D.PERT requires computer solutions whereas CPM is a manual technique.
E.PERT is measured in days whereas CPM uses weeks or months.
第4题：
The maximum difference between mean time and apparent time is ______.
A.equal to the longitude expressed in time units
B.about 16 minutes
C.the difference between the GHA of mean sun and the first point of Aries
D.15°of arc
第5题：
The height of a light is measured from which reference plane?
A.Mean low water
B.Mean high water
C.Average water level
D.Geographical sea level
第6题：
It was()to see the students' excitement when they discovered that simple materials could be used to cook food under the sun and the solar cooking really attracts those creative kids.
A. amazing
B. amazed
C. amaze
答案：A
解析：本句意思：当学生们发现简单的材料可以用来在太阳下烹饪食物时，他们的兴奋之情(令人惊讶)，而太阳能烹饪真的吸引了这些有创造力的孩子们。系动词be后是表语，所以不用原形amaze；作表语时，如果主语是事件，多用ing形式，同时表示主动关系；如若主语是人，多用ed形式，同时表示被动关系，所以选A。
第7题：
__________the sun is the central body of the solar system so the nucleus is the core of the atom．
A．When
B．If
C．Now that
D．Just as
第8题：
A.derive
B.to derive
C.deriving
D.of deriving.
第9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.The motion of the apparent sun is along the ecliptic
B.Measurement of time is along the celestial equator
C.The speed of the Earth's revolution is not constant
D.There are variations in the Earth's rotational speed
第10题：
A signal indicating Greenwich mean time would be preceded with ______.
A.a code hoist to indicate Greenwich mean time to follow
B.the letter G
C.the letters GT
D.the letter Z