2. 外语
  3. Knowledge of microscopic anatomy was greatly expanded during the 20th century as a result of the development of microscopes that

Knowledge of microscopic anatomy was greatly expanded during the 20th century as a result of the development of microscopes that

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问题 Knowledge of microscopic anatomy was greatly expanded during the 20th century as a result of the development of microscopes that provided much greater resolution, arid magnification than had conventional instruments, thus revealing formerly unclear or ______ detail.(visible)
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答案invisible
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