单项选择题
A.≤0.4s B.≤0.5s C.≤0.6s D.≤0.7s
A.≤1.4s B.≤1.5s C.≤1.6s D.≤1.7s
A.≤0.6s B.≤0.7s C.≤0.8s D.≤0.9s
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