prototype meter造句

例句与造句

1. In 1908, two teams of researchers, one led by Michelson, defined the length of the international prototype meter in terms of light waves.
2. Because the definition of the meter is now based on a light wavelength, the international prototype meter is not quite as indispensable as it once was.
3. In contrast, the reference standard for the meter is no longer defined by a physical object ( as the former international prototype meter ( IPM ) or originally the " m鑤re des Archives " ).
4. This agreement replaced the 1889 international prototype meter located in Paris, which was a metal bar made of a platinum-iridium alloy ( one of a series of standard meter bars, originally constructed to be one ten-millionth of a quadrant of the Earth's polar circumference ).
5. At the same time, the International Prototype Meter was used as standard for the length of a meter until 1960, when at the General Conference on Weights and Measures the meter was defined in terms of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in vacuum.
6. It's difficult to find prototype meter in a sentence. 用prototype meter造句挺难的