英语翻译Only in the most exceptional circumstances is the lifespan of a patent extended to alter this normal process of events.The longest extension ever granted was to Georges Valensi; his 1939 patent for color TV receiver circuitry was extended
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![英语翻译Only in the most exceptional circumstances is the lifespan of a patent extended to alter this normal process of events.The longest extension ever granted was to Georges Valensi; his 1939 patent for color TV receiver circuitry was extended](/uploads/image/z/1924061-5-1.jpg?t=%E8%8B%B1%E8%AF%AD%E7%BF%BB%E8%AF%91Only+in+the+most+exceptional+circumstances+is+the+lifespan+of+a+patent+extended+to+alter+this+normal+process+of+events.The+longest+extension+ever+granted+was+to+Georges+Valensi%3B+his+1939+patent+for+color+TV+receiver+circuitry+was+extended)
英语翻译Only in the most exceptional circumstances is the lifespan of a patent extended to alter this normal process of events.The longest extension ever granted was to Georges Valensi; his 1939 patent for color TV receiver circuitry was extended
英语翻译
Only in the most exceptional circumstances is the lifespan of a patent extended to alter this normal process of events.
The longest extension ever granted was to Georges Valensi; his 1939 patent for color TV receiver circuitry was extended until 1971 because for most of the patent’s normal life there was no colour TV to receive and thus no hope of reward for the invention.
43.George Valensi’s patent lasted until 1971 because ________.
[A] nobody would offer any reward for his patent prior to that time
[B] his patent could not be put to use for an unusually long time
[C] there were not enough TV stations to provide colour programmes
[D] the colour TV receiver was not available until that time
我选了D 能不能帮我分析一下
英语翻译Only in the most exceptional circumstances is the lifespan of a patent extended to alter this normal process of events.The longest extension ever granted was to Georges Valensi; his 1939 patent for color TV receiver circuitry was extended
不好意思,看错了!应该是B,他的专利好长一段时间都没被投入使用.其实这与D的意思有点接近,而B发生在前,先要使用专利,才能选出彩电,所以B是优先与D,