Some hearing milestones your child should reach in the first year of life: 1  Most newborn infants startle or jump to sudden loud noises. 2  By 3 months, a baby usually recognizes a parent's voice. 3  By 6 months, a baby can usually turn his or her eyes or head toward a sound.
(December 2008). Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer). DDC is considered by many to be a more modern, granular and responsive update to older HVAC control systems based upon PLC technologies.
Essential Information. Computer numerically controlled (CNC) machinery is used by CNC operators to cut and shape metal and plastic for various types of manufacturing. CNC operators must have mechanical skills and be able to read blueprints.