题目内容
The four characteristics of laser light refer to ( ).
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( ) can be used for low-power irradiation or repair of skin, facial features, maternity, etc., because it has the effects of stimulation, anti-inflammatory, analgesia and vasodilation.
According to the type of laser working substance. Lasers can be divided into ( ).
Using laser technology to print the required marks or labels on the surface of the material belongs to ( ).
The material used to make the model with the laser is ( ).
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