空气通过消声器时的流速不宜超过下列数值。阻性消声器 5~10m/s (要求 4~6m/s )共振型消声器 5m/s ,消声弯头( ) m/s 。
A.
1~2
B.
3~5
C.
6~8
D.
7~9
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