Although there is no standard size for a chest of drawers, the most common size is 38 inches wide. A chest of drawers this size is small enough to fit in most bedrooms, but large enough to have ample storage space. The drawers are also small enough that they won't buckle or sag over time.
A duplex is defined as a house or building with two separate units. An example of a duplex is a house with two living units with a common wall. 1  double; twofold.  designating or of a system of telegraphy in which two messages may be sent simultaneously in opposite directions over a single circuit.
Duplex ultrasound uses sound waves to detect how blood flows through the blood vessels and to reveal any blockages. Duplex ultrasound combines traditional ultrasound with Doppler ultrasound. Regular ultrasound uses high-frequency sound waves to create images of organs within the body.