( )system
interact with environment strongly.
A: Open
B: Close
C: Bright
D: Dark
interact with environment strongly.
A: Open
B: Close
C: Bright
D: Dark
举一反三
- If<br/>a light passes through a small pinhole, and incident on a screen.<br/>What will be observed on the screen? A: A<br/>sharp bright point of the width equal to width the pinhole B: A<br/>bright point of the width equal to width the pinhole but of less<br/>intensity C: A<br/>bright ring at the center surrounded by alternate dark and bright<br/>rings D: A<br/>diffused bright point
- If bright part is F11 and dark part is F8 metered by light metering, there is one aperture between the bright part and dark part. The light ratio between the bright part and the dark part is ______. A: 2:1 B: 4:1 C: 1:4 D: 1:2
- keeping the homeostasis<br/>of the internal environment depends on the () A: Non-automatic<br/>control system B: Negative<br/>feedback control system C: positive<br/>feedback control system D: Feed-forward<br/>control system E: nervous<br/>and endocrine regulation.
- The resistance of a light sensor in bright light is ________ that in the dark
- Which of the following descriptions is correct? A: The microscopic viewpoint studies the large-scale properties of matter (temperature, pressure, volume, etc.). B: The part of the universe under study in thermodynamics is called the system; the parts of the universe that can interact with the system are called surroundings. C: For an open system, only matter can be transferred between system and surroundings. D: A closed system must be an isolated system, but an isolated system may not be a closed system.