题目内容
Magnetic field strength in a long coil is determined by（）
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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（）
Which of the following is the least sensitive developer（）
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