A passive sensor uses« Back to Previous Page
A. sun as the source of energy
B. flash light as a source of energy
C. its own source of energy
D. None of these
|
▲ ▼ |
A. sun as the source of energy |
▲ ▼ |
A. sun as the source of energy |
▲ ▼ |
A. sun as the source of energy |
Please log in to post questions/answers: