________ sensors are designed to detect thermal energy.
A) Ultrasonic motion
B) Microwave motion
C) Passive infrared (IR)
D) Doppler shift
E) All of the above.
Correct Answer:
Verified
Q4: Although inexpensive to purchase initially, the _
Q5: For maximum effectiveness, chain link fences should:
A)
Q6: _ generally rely on microcomputer technology and
Q7: Utilizing _, an image can be converted
Q8: Closed circuit television (CCTV):
A) Enhances safety and
Q10: A _ alarm system is owned and
Q11: The first step to effective alarm system
Q12: Fire prevention activities include all but which
Q13: Fire protection focuses on all but which
Q14: _ extinguishers are effective against Class D
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