Materials and Methods: 22 patients were radiographed in PA view and left lateral view with esophageal barium swallow, 19 were confirmed by operation, 2 by angiography, 1 by US doppler.

材料和方法：22例均行心脏正位及左侧位食道吞钡摄片，19例经手术证实，2例经造影证实，1例经彩超证实。

Where backing welds are radiographed for their full length to meet code requirements before clad side high alloy welding is done, this requirement may be omitted with prior approval of the Purchaser.

在复合侧高合金焊接之前，如果要对打底焊道在全长上进行射线检测，则事先经买方同意后可忽略此项要求。