单项选择题X 纠错
A.40m B.50m C.60m
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单项选择题
A.30mB.40mC.50m
A.110% B.120% C.130%
A.700mm B.900mm C.1000mm
A.800mm B.1000mm C.1200mm
A.10Ω B.20Ω C.30Ω
A.3Ω B.4Ω C.5Ω
A.80db B.90db C.120db
A.80db B.100db C.120db
A.0.2% B.0.3% C.0.4%
A.0.3% B.0.4% C.0.5%
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