单项选择题
A.5 B.6 C.7 D.10
A.15mm B.20mm C.30mm D.50mm
A.0.6 B.0.8 C.1 D.1.2
A.≤0.04dB、≤0.1dB B.≤0.08dB、≤0.14dB C.≤0.64dB、≤0.12dB D.≤0.12dB、≤0.38dB
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