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Give the meaning of
• deafness
• loss of efficiency
• auditory fatigue
• non auditory problem
• trouble in speech

2. What is the Symbol of Hertz?

a.Hz
b.dB
c.HL
d. none of the above

3. what is the symbol of dB ?
4. what is the symbol of HL ?
5. what is rodents?
6. what is transmission?