A. Information
B. Representation
C. Suppression
D. Depression
A. Water Canister Humidifier
B. Steam Canister Humidifier
C. Ultrasonic Humidifier
D. Infrared Humidifiers
A. 2
B. 1
C. 4
D. 3
A. Direct and Indirect
B. Mean and Median
C. Up and Down
D. Classified and Declassified