Unverified80% confidenceCautionTime unknown
若主要用途是裁判执哨或室内教学,双频高分贝设计在封闭空间内可能过于刺耳,建议考虑分贝更温和的单频哨
1
Sources
80%
Confidence
Long-term
Relevance
-
First Seen
Sources
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