题目内容

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

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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

已知空气流经以缩放型喷管,空气的滞止压力为P0=500kPa,临界压力比μcr=0.528,该喷管喉部截面的压力为( )kPa。

A.264
B.309.8
C.364.8
D. 254