A. τ2max：τ1max=1：2，φ2：φ1=1：4
B. τ2max：τ1max=1：4，φ2：φ1=1：8
C. τ2max：τ1max=1：8，φ2：φ1=1：16
D. τ2max：τ1max=1：4，φ2：φ1=1：16
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