Concerning a celestial observation,the azimuth angle is measured from the principal vertical circle to the().
The accuracy of scientific observation and calculations is always at the mercy of the scientist’s timekeeping methods.
My position has been obtained () astronomical observation.
According to the author’s observation, college students _____.
The Lists of Meteorological Observation Stations can be found in().
According to the author’s observation, college students _____.
According to Skinner, language behavior can only be studied through observation of the()factors.
A line of position from a celestial observation is a segment of a ().
观察法(observation)
Observation有三种类型,以下不是的为()。