题目内容
The contact angle for most commercial liquid penetrants has which of the values listed below（）
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Magnetic field strength in a long coil is determined by（）
Non metallic inclusions can also be found with magnetic particle inspection as well as cracks. This is due to a change in what property of the inclusion in relation to the parent materials（）
Penetrants which have an emulsifier already in them referred to as（）
Wettability of a liquid penetrant is controlled by which of the following factors（）
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