单项选择题
A.0.1 B.0.2 C.0.05 D.0.15
A.30%~100% B.30%~90% C.20%~90% D.20%~100%
A.不大于45ms B.不大于50ms C.不大于55ms D.不大于60ms
A.不大于2s B.不大于1.5s C.不大于2.5s D.不大于3s
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