Tin, lead and their alloys, due to their low melting temperatures and wide availability, are the most commonly used solder materials. In fact, lead has been used as a soldering metal for water pipes (also made of lead) even in Roman times, hence the scientific name for lead, Plumbum. Mechanical Properties.
hearing impairment - impairment of the sense of hearing. hearing disorder. disability, disablement, handicap, impairment - the condition of being unable to perform as a consequence of physical or mental unfitness; reading disability; hearing impairment. deafness, hearing loss - partial or complete loss of hearing.
Auditory Processing Disorder (APD), also referred to as Central Auditory Processing Disorder (CAPD), is very common and affects about 5% of school-age children.he best learning environment for a student with auditory processing is always one-to-one with very minimal distractions and outside noises. Students who have severe auditory processing disorder may need an intensive training program to catch up and stay up with the rest of their class.