单项选择题
A.1/2 B.1/3 C.3/4 D.3/5
A.0.1 B.0.2 C.0.3 D.0.4
A.≤5.5s B.≤6.5s C.≤7.5s D.≤9s
A.≤3.8s B.≤5.5s C.≤6.5s D.≤7.5s
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