A、<span style="font-size: 10.5pt; font-family: 宋体;">管中心最大</span>
B、<span style="font-size: 10.5pt; font-family: 宋体;">管壁处最大</span>
C、<span style="font-size: 10.5pt; font-family: 宋体;">管中处处相等</span>
D、<span style="font-size: 10.5pt; font-family: 宋体;">管壁处最小</span>
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