Technician a says that air-conditioning service machines are used exclusively with hfc-134a systems. technician b says that refrigerant containing sealers should be recycled. who is correct?

What percentage of companies is projected to use social media to locate new employees in 2012

Acomputer has a two-level cache. suppose that 60% of the memory references hit on the first level cache, 35% hit on the second level, and 5% miss. the access times are 5 nsec, 15 nsec, and 60 nsec, respectively, where the times for the level 2 cache and memory start counting at the moment it is known that they are needed (e. g., a level 2 cache access does not even start until the level 1 cache miss occurs). what is the average access time?

Companies that implement and apply an information system effectively can create