end shield attachment
... expiration date 有效期 end shield attachment 端盖附件 eyebolt 有洞的螺栓 ...
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本加热器是常用的管壳式换热设备，由端盖、壳体、管组和附件组成。
The heater is a kind of used shell- and-tube heat exchanger which consists of head cover, Shell, nest of tubes and accessories.
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