Запишите предложения. выпишите из них сказуемые, определите их видо-временные формы и залог. переведите. 1. experts in mine construction technologies have been shown some types of new building materials. 2. in australia and south africa open cast mining is used for both thermal and metallurgical coals. 3. the results of calculation are influenced by the calculation method. 4. the operator had to replace only one part in that device.