单项选择题
A.0.5 B.0.51 C.0.55 D.0.6
A.0.325s B.0.475s C.0.525s D.0.625s
A.0.1s B.0.15s C.0.2s D.0.25s
A.93%~103% B.95%~105% C.97%~107% D.100%~110%
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