How is the plastic indicator layer positioned relative to the take-off board______________?
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Answer: A. 3mm
Explanation
The plastic indicator layer for the long jump foul line rises a specific small margin above the board. This three millimeter elevation ensures that any foot contact leaves a clear mark in the plasticine. Judges inspect this layer immediately after a jump to verify whether a foul occurred. Long jump takeoff boards feature a removable tray filled with soft plasticine material. Athletes must jump behind the foul line to record a legal measurement. Official rules establish precise construction standards for all horizontal jump facilities.
Precise foul line mechanics eliminate guesswork for judges monitoring fast paced jumps. Athletes practice taking off right at the edge without touching the three millimeter indicator. Major championships utilize advanced video technology alongside plasticine boards for accuracy. Option B suggests four millimeters which exceeds the standard indicator layer height. Option C suggests five millimeters which is too high for a standard takeoff board indicator. Option D suggests seven millimeters which would create an excessive step up for jumpers.
- Subject
- Physical Education
- Category
- Physical Education
- Topic
- —
- Difficulty
- medium
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