A．Failure must crane before success.
B．Failures can be avoided.
C．Failure is not all bad.
D．Failures are unavoidable..

用MATLAB最优化工具箱的相关函数编程求解： minf(X)=-4x1—3x2—4x3 s.t. 2x1+2x2+x3—250≤0 x1+4x2+2x3—320≤0 2x1+x2+2x3一260≤0 x1，x2，x3≥0 点击查看答案

Thomas Alva Edison is known as one of the greatest inventors of his time. He was awarded more patents(专利权) on inventions than any other Americans. When he died in 1931, Americans wondered how they could best show their respect for him. One suggestion was that the nation observe a minute or two of total blackout(停电). All electric power would be shut off in homes, streets and factories. Perhaps this suggestion plan made Americans realize fully what Edison and his inventions meant to them. Electric power was too important to the country. Shutting it off even a short time would have led to complete confusion. A blackout was out of the question. On the day of Edison's funeral(葬礼), many people silently dimmed their lights. In this way they honored the man who had done more than anyone else to put the great force of electricity at his countrymen's fingertips.Which of the following statement is true according to the first paragraph?A．Edison received the first American patent.B．Edison got the most patents in America at that time.C．Edison was the only American inventor.D．Edison was the first American inventor.

A.
B.
C.
Which
D.Edison
E.
B．Edison
F.
C．Edison
G.
D．Edison
H.

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