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【单选题】
单层厂房排架柱内力组合中可变荷载的下列特点,( )有误。A.
吊车竖向荷载，每跨
B.
最大轮压在左、最小轮压在右及最小轮压在左、最大轮压在右两种情况，每次只选一种
C.
吊车横向水平荷载同时作用在该跨左、右两柱，且有正、反两个方向有最大轮压或最小轮压或必有水平荷载，但有水平荷载不一定有最大轮压或最小轮压
D.
风荷载有和右来风，每次选一种
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