prototype metre造句

例句与造句

1. Until 1875 the French government owned the prototype metre and kilogram, but in that year the inter-government organisations.
2. In 1799, it was redefined in terms of a prototype metre bar ( the actual bar used was changed in 1889 ).
3. British scientists, philosophers and engineers have been at the forefront of the Johnson, Matthey & Co manufactured the international prototype metre and kilogram.
4. The International Conference on Geodesy in 1867 called for the creation of a new, international prototype metre and to arrange a system where national standards could be compared with it.
5. The International Conference on Geodesy in 1867 called for the creation of a new, " international prototype metre " ( IPM ) and the arrangement of a system where national standards could be compared with it.
6. It's difficult to find prototype metre in a sentence. 用prototype metre造句挺难的
7. However, it was later determined that the first prototype metre bar was short by about 200 micrometres because of miscalculation of the flattening of the Earth, making the prototype about 0.02 % shorter than the original proposed definition of the metre.
8. Using this measurement and the latitudes of the two cities they could calculate the distance between the North Pole and the Equator in classical French units of length and hence produce the first prototype metre which was defined as being one ten millionth of that distance.
9. Their well-known use is in metrology, where they are used to make the international prototype measures used by international standards bodies for mass standards such as the international prototype kilogram and the international prototype metre, although the latter has now been superseded by a standard based on the vacuum speed of light.
10. For example, the 1927 1960 definition of the metre specified that the International Prototype Metre bar was to be measured while " supported on two cylinders of at least one centimetre diameter, symmetrically placed in the same horizontal plane at a distance of 571 mm from each other . " Those would be the Bessel points of a beam 1020 mm long.
11. Until 1875, the French government owned the prototype metre and kilogram, but in that year the Convention of the metre was signed, and control of the standards relating to mass and length passed to a trio of inter-governmental organisations, the senior of which was the General Conference on Weights and Measures ( in French the " Conf閞ence g閚閞ale des poids et mesures " or CGPM ).