單項(xiàng)選擇題
A.±0.05% B.±0.1% C.±0.15% D.±0.2%
A.0.1% B.0.15% C.0.5% D.1%
A.1/4 B.1/3 C.1/2 D.2/3
A.±1 B.±2 C.±3 D.±5
A.1mm B.2mm C.3mm D.5mm
A.75DB(A) B.80DB(A) C.85DB(A) D.90DB(A)
A.60% B.70% C.80% D.90%
A.0.1mm B.0.15mm C.0.2mm D.O.25mm
A.300 B.400 C.500 D.600
A.4 B.10 C.20 D.30
A.ф3 B.ф5 C.ф8 D.ф10