Penetrants which have an emulsifier already in them referred to as（）
A. Post emulsifiable
B. Solvent removable
C. Water washable
D. Lipophilic penetrant
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Wettability of a liquid penetrant is controlled by which of the following factors（）
A. Cosine of the contact angle
B. Viscosity
C. Surface tension
D. Both cosine of the contact angle and surface tension
Which of the following is the least sensitive developer（）
A. Dry powder
B. Aqueous soluble
C. Aqueous suspendable
D. Non-aqueous wet
contingent（）
A. groups of people
B. distinction
C. notion
D. morality
symbolize（）
A. make signs
B. show pity
C. represent
D. present
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