SSE Composite Index theory, will once again test the support line at 1660 - 1670.
上证综指理论上将再次考验1660-1670点一线的支撑.
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After installation of valve, support line ; a sagging pipe line can distort valve and cause failure.
安装阀门后, 要支撑住管道: 下垂的管道会使阀门产生变形而导致失败.
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