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The first steam engine was devised by _______ at the end of the 17th century，and the Scottish inventor James Watt modified and improved the design in 1765.
The first steam engine was devised by _______ at the end of the 17th century，and the Scottish inventor James Watt modified and improved the design in 1765.
A.John Kay
B.Thomas Newcomen
C.Edmund Cartwright
D.Richard Arkwright
正确答案是B
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