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?
把试件加载至不同的载荷水平后，向裂纹注入荧光渗透剂；
Under a certain load level, flourescent penetrant is injected into the crack of specimen.
把试件加载至不同的载荷水平后，向裂纹注入荧光渗透剂；
Under a certain load level, flourescent penetrant is injected into the crack of specimen.
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