Physics Unit12: Sound (id: f1250af90)

本题目来源于试卷: Physics Unit12: Sound，类别为 通用国际物理

[单选题]
If a jet plane were to double its MACH-speed, its haa)*4w tqema s.7y j.enlf-angle will decrease by .u.,nqk-sjp9q, k i xb(++kzry*u i qsa qq.ip,s.zqb ,9kursyjk* kux(n-+i+factor of:

A. 1/2
B. 2
C. ${\sin }^{-1}(1/2)$
D. none of the above


参考答案:  D


本题详细解析: 暂无

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