Mathematics
Undergraduate
่ณๆฅ๐จ่งฃใๆนๆใใฆใใ ใใ
B
ใใ 6. ๅๅผงใจ็ด็ท้ใซๅๅพ20mmใฎๅๅผงใๆใใชใใ
+
C-
R15
- D
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