1. 10 3 1 2 C 10 3 4 1 2 1 1 30C 2 2. 3 3 lg 39mL 30 3 3 000Xg 4 C 20 T 2 Qo 3. 20 A 20 B 20 C 10 50mL 2 D 1 H 1 2 A 3 B 4 SS 50ng mL 2ppm 4. 1 3 d 15 5 3 1 Qo 3 5. E PE PE PE PP PEP PP PET E E PET 2 1 6. 2 3 4 5 6 7 7. 100uL 3 1 4 8. A 1 1 50mL 100 pL 1 2 C 10 10 C 10 1 9 C 10 9. 5 15 15 S0ng mL 2ppm 10. 20 TEL 029 842 4333 FEAX 029 842 3216 nCA003 4 11. 2008 3 3 Se mm os1 H H