NOTE the transmission technique has insufficient sensitivity to detect the discontinuities found in spheroidal graphite cast iron castings and is used in exceptional cases only.

注意：对于检测球墨铸铁中的缺陷来说，穿透技术的灵敏度不够，只有在特殊情况下使用该技术。

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NOTE the transmission technique has insufficient sensitivity to detect the discontinuities found in spheroidal graphite cast iron castings and is used in exceptional cases only.

注意：对于检测球墨铸铁中的缺陷来说，穿透技术的灵敏度不够，只有在特殊情况下使用该技术。

youdao