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| What is characteristic of an isophase light? |
| A) 4 sec. flash, 2 sec. eclipse, 3 sec. flash, 2 sec. eclipse |
| B) 6 sec. flash, 3 sec. eclipse |
| C) 1 sec. flash, 1 sec. eclipse |
| D) 2 sec. flash, 5 sec. eclipse |
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