The submersible motor enclosure including frame, end brackets, flanges and cap assembly shall be constructed of close-grained cast iron, ASTM A-48, Class 30 or better.
潜水电机壳体，包括机架，尾轴承架，法兰和罩盖总装，必须采用符合美国材料试验协会ASTM A - 48类别30标准的、密实的铸铁或更好的材料制造。
The fill back of the bridge and culvert, because of its especial position, has compressed not very close-grained sometimes. The sinking is a familiar disease.
桥涵台背回填，由于其位置特殊，往往辗压不实，发生沉降是一种常见病害。
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