坝下涵洞断裂破坏的原因是什么?断裂漏水的处理方法有哪些?
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渡槽接缝止水目前采用最多的是橡皮坟板式止水。
A. 对
B. 错
修补倒虹吸管横向裂缝的两种较好的方法是隔温和全面加固。
A. 对
B. 错
隧洞和涵管充水时应迅速进行,以免洞内产生负压、水锤等现象而引起破坏。
A. 对
B. 错
Brand neutral packaging refers to the packaging().
A. without country name of production, place name, factory name and trademark
B. without country name of manufacture, but name of foreign manufacturer
C. without country name of production, but there is a trademark designated by the buyer
D. without anyinformation