单项选择题
A.≤3.8s B.≤5.5s C.≤6.5s D.≤7.5s
A.29420N±1961N B.49033N±3266N C.＞88254N D.88420N±1961N
A.≤0.5A B.≤0.6A C.≤0.7A D.≤0.8A
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