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.
The duplex ultrasound is a diagnostic test administered to assess blood circulation. It combines the techniques of traditional ultrasound with those of Doppler ultrasound. Traditional ultrasound uses sound waves to create black-and-white images of the veins and arteries.