单项选择题
A.14 B.16 C.18 D.20
A.2 B.4 C.6 D.8
A.8 B.10 C.12 D.16
A.≤5% B.≤2% C.≤1% D.≤0.5%
A.±2度 B.±1.5度 C.±1度 D.±0.5度
A.±0.050V B.±0.030V C.±0.020V D.±0.010V
A.63 B.31 C.15 D.7
A.绿灯常亮 B.绿灯缓慢闪烁 C.灯快速闪烁 D.红灯常亮
A.10 B.8 C.6 D.4