下列选项中,关于合成高分子防水卷材外观质量要求,说法错误是()。
A. 每卷折痕不超过2处,总长度不超过20mm
B. 杂质大于0.5mm颗粒不允许,每1m2不超过9mm2
C. 每卷胶块不超过6处,每处面积不大于4mm2
D. 每卷凹痕不超过6处,深度不超过本身厚度的40%
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读者有过期未还图书或欠款情况时,不允许借书。
A. 正确
B. 错误
In which scenario do you use the Flashback Database feature?()
A. when a table is dropped and you restore it from the Recycle Bin
B. when a user’s schema is dropped and you recover the user’s schema
C. when some incorrect data is inserted in the table and you retrieve the table to a state that was at a certain timestamp
D. when a row of a table is updated frequently and committed, and you view all the versions of the row within a specific duratio
建筑功能、建筑技术及建筑形象是建筑构成的三大要素,其中首要考虑的是建筑技术。
A. 正确
B. 错误