题目内容

True or false? By 2020, all chipswill have the computationsal power of a human brain.

A. True
B. False

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True of False? By 2020, AI will create more jobs than it kills, but the skills for the new jobs will be more demanding.

A. True
B. False

True of false? It is highly probable that Oprah Winfrey will run the presidential race in 2020.

A. True
B. False

在喷管中进行等熵流动,若背压大于临界压力,则应选择( )。

A. 渐缩管
B. 渐放管
C. 缩放管

已知空气流经喷管,初态参数:P1=500kPa,T1=300K,cf1=140m/s,cp=1004J/(kg.K)该状态下的滞止温度为( )K。

A.300.8
B.309.8
C.319.8
D.300