Circle the correct options. 1. I would / used to be much happier when I was living in Kazakhstan, you know. 2. I was having / had been having a shower when the phone rang. 3. I had ridden / had been riding a camel twice before my trip to Egypt last year. 4. When Asemgul was at university, she avolded / had been avoided cooking altogether.
two points on the basis of horizontal distance and the vertical angle between
them, doesn't it?
2) Is it usually combined with the triangulation work, the vertical angles being
measured at the same time as the horizontal angles?
3) What is measured to some definite point on the signal the height of which above the station was determined when the signal was erected?
4) Should the height of the instrument above its own station also be measured and recorded?
5) Are in a very precise work angles measured with a special vertical circle
instrument?
6) Are the best results obtained by averaging several independent readings half of which are taken with the telescope direct and other half with the telescope inverted?
7) The chief difficulty in obtaining accurate results by trigonometric levelling
is the uncertainty in the coefficient of refraction of the air, isn't it?
8) What can be eliminated is by taking simultaneous observations between two
stations?
9) What consists in computing the difference in elevation of two points on the basis of horizontal distance and the vertical angle between them?
10) What results are obtained by averaging several independent readings half of which are taken with the telescope direct and other half with the telescope inverted?