A、<span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 14px"><strong>高强度构件中</strong></span>
B、<span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 14px"><strong>低强度构建中</strong></span>
C、<span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 14px"><strong>两者交界处</strong></span>
D、<span style="FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 14px"><strong>柱子上</strong></span>
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