工程施工期間使用的建筑物稱為()。
A、臨時性建筑物A
暫無解析
設曲線L:f(x,y)=1(f(x,y)具有一階連續偏導數),過第II象限內的點M和第IV象限內的點N,T為L上從點M到點N的一段弧,則下列小于零的是()
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