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奈奎斯特频率是什么

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The girls at the back of the classroom couldn't help_________when the inexperienced young teacher stammered.

Linda__________the famous director into giving her a leading role in one of his plays and she became instantly successful.

If any of the runners interfere with the others during the competition, the race is automatically declared null and___________.

Various devices have been tried to supply the diver with air and thus permit a(n)________stay under water.

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