400-1816-180
本題由hyman1提供
In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.
A. laws, an observation about electric current first made in 1845 and
B. laws, which was an observation about electric current first made in 1845 and it is
C. laws, namely, it was an observation about electric current first made in 1845 and
D. laws, an observation about electric current first made in 1845, it is
E. laws that was an observation about electric current, first made in 1845, and is
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