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单项选择题

某-6层砌体房屋，如分别位于Ⅰ、Ⅱ、Ⅲ类场地上，当其他条件相同时，房屋所受的总水平地震作用的大小正确的是( )。

A.位于Ⅰ类场地上最大
B.位于Ⅱ类场地上最大
C.位于Ⅲ类场地上最大
D.在各类场地上，房屋所受的总水平地震作用相同
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