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| For stubborn, hard scale deposits on the inside of the tubes of a seawater-cooled shell-and-tube heat exchanger, what is typically the preferred method of cleaning? |
| A) Mechanical cleaning with specially designed brushes. |
| B) Flushing with hot fresh-water. |
| C) Mechanical cleaning with specially designed reamers. |
| D) Chemically cleaning with descaling compounds. |
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