下列哪条是荧光渗透剂相对于着色渗透剂的优点？
Which of the following is an advantage of fluorescent penetrants over visible type penetrants?
打磨区也用着色渗透剂进行了检查，以便确保无裂纹尖端留存。
The ground area was also checked with dye-penetrant to ensure that no crack tip remained.
打磨区也用着色渗透剂进行了检查，以便确保无裂纹尖端留存。
The ground area was also checked with dye-penetrant to ensure that no crack tip remained.
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