在房屋适当位置设置的垂直缝隙,把房屋划分为若干个刚度较一致的单元,使相邻单元可以自由沉降,而不影响房屋整体,这种缝称为()
A.沉降缝
B.防震缝
C.分格缝
D.伸缩缝
参考答案:A
生产与消费的辩证关系原理。
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血栓栓塞(thromboembolism)