Human-computer interface mainly refers to ().
A. Control and operation system
B. control system
C. Display system
Display and control system
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The gradient direction of the function f(x) at a certain point is () of the function at that point.
A. direction of steepest rise
B. rising direction
C. direction of steepest descent
D. descending direction
Which option is not a fundamental property of perception?()
A. integrity
B. retentivity
C. comprehension
D. permanence
When people move from a darker environment to a brighter one, the adaptation process of the human eye is called ().
A. Perception of brightness
B. Sense of brightness
C. Adaptation of brightness
D. Adaptation of darkness
When designing a desk, which dimension is its drawer bottom surface apart from ground height should be referenced?()
A. Sitting height
B. Leg bending height
C. The thickness of the thigh