Exclamation marks are seldom if ever seen in professional writing and certainly not in research reports. Instead you must make your emphasis clear by a careful choice of vocabulary. Some languages use exclamation marks in their scientific writing. English does not.
Remember if you leave an exclamation mark in, the journal will delete it so do them a favor and delete it yourself. Again, check your spreadsheet and photocopied articles to note that they do not contain exclamation marks.
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