Software installation extension cannot perform removal or install operations during asynchronous policy refresh and will force a synchronous foreground refresh.
在异步策略刷新时，软件安装扩展不能运行删除或安装操作，并将强制进行同步前台刷新。
The node structure has determined force transfer, capacity of controlling the crack development effectively, convenient construction and excellent engineering application foreground.
该节点传力明确、不带环梁、能有效控制板柱交接处裂缝的开展、施 工方便，有很好的工程应用前景。
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