A.不大于700N B.不大于600N C.不大于500N D.不小于800N
A.30 km/h B.40 km/h C.50 km/h D.20 km/h
A.90~115dB(A) B.70~85 dB(A) C.115 dB(A)以上 D.不得大于90 dB(A)