Поставьте глаголы, данные в скобках в правильную форму. Переведите предложения на русский язык: 1. Manganese steels (to be) very hard.
2. Molybdenum (to add) strength and hardness to steel.
3. Vanadium (to give) lightness, toughness and strength to the steel.
4. Vanadium steel (to be) highly shock-resistant.
5. Tungsten (to have) a higher melting point than any other metal.
6. Chromium steel (to contain) from 11 to 18 per cent chromium.