Ex. 3. Make up the sentences from the following words and translate them into Russian:

1. There / several / alloys / groups / important / metals / of / and / are.

2. Metals / corrosion / undergo / can.

3. Organic / corrosion /coatings / protect / steel / metals / from /and.

4. Many / are / as / elements / classified / semimetals.

5. Nonmetals / properties / properties / chemical / show / great / variety / of.

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