Question

а) определите форму причастия в предложении; б) предложения переведите.
A. Using isotopes in measuring the diffusion of metals we got much more accurate data.
B. Scientists have found a simple way to produce a laser beam of any colour and frequency desired.
C. Being produced by the laser the narrow intense beam travels great distances without spreading.
D. Having reached the surface of the Moon, it returned to the Earth three seconds later, its return being recorded by sensitive devices.