比φ3mm平底孔回波声压小7dB的同声程平底孔直径是:()
2023-06-02
比φ3mm平底孔回波声压小7dB的同声程平底孔直径是:()
A.φ1mm
B.φ2mm
C.φ4mm
D.φ0.5mm
参考答案:B
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
类别: 题库 |
2023-05-24
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