单项选择题
A.3 B.4 C.5 D.6
A.1 B.1.5 C.2 D.2.5
A.≤0.4s B.≤0.7s C.≤0.6s D.≤0.8s
A.2.2A～2.86A B.2.3A～2.9A C.4.5A～6.75A D.7.8A～8.7A
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