单项选择题
A.93%~110% B.90%~110% C.80%~120% D.75%~130%
A.大于 B.等于 C.小于 D.小于等于
A.1±0.05 B.1±0.2 C.1±0.1 D.1±0.02
A.20ms B.100ms C.200ms D.10个周波
微信扫一扫,加关注免费搜题