[判断题]A scientific discovery is often made long before someone is able to put it to use,as occurred more than thirty years ago with the discovery of coherent light and the invention of the laser.
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2023-10-01 01:38:31
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[判断题]A scientific discovery is often made long before someone is able to put it to use,as occurred more than thirty years ago with the discovery of coherent light and the invention of the laser.

A.对
B.错
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