4 1 () 80g () 1/2 5 4 8 4 () 8 (5mm) 4 1. 2.(1) 3. 4.21(3)21 5. 6.(5) 7.(2)(6)
2 4 30g 20g 1 2 1 2 2 1/2 1 1 2 1. 2.1 3.2(2) 4.(3)4 5.(4)(1)
