Из пассивного залога сделать активный 1. Many shapes had to be manufactured at a relatively high cost. 2. Different kinds of steel will have to be used in making blades. 3. High carbon steel may be hardened by heating it to a certain temperature and then quickly cooling in water. 4. Vanadium steel can be used for springs. 5. Larger drills could be used in that machine.
1. We had to manifacture many shapes at a relatively high cost. 2. We will have to use different kinds of steel in making blades. 3. We can harden high carbon steel by heating it to a certain temperature and then quickly cooling in water. 4. We can use vanadium steel for springs. 5. We could use larger drills in that miachine.
