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2008
1 1 ()() 300 150 2 3 1 4H l C 12 O 16 Na 23 S 32 Cl 355 Fe 56 As 75 1 ( 1 26 ) ( 8 ֧ 6 3 0 ) 14 A B C D 15 Ek c h m

16 P0 M(kg) V1 v2 1 kg Q l kg

17T A B T E

18 M AB R 1/4 BC ɭ m A BC D l BC z B D A R x B x C m x D M x 19 L n1 n2 R r

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ab S l 2 r/R 20ǧ J T E B

21׳ f n1=120 n2=125 ( ) A i=O B i=45 C i=75 D i

( 1 74 ) (k §ҧզ) 22(17 )( 1 5 ) Rx 5 (1)伧֡ (T 6 V O 20 )

(2) z=______cm d= ______mm I=______A U=______V p=_______(˧)

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23(15 )2007 11 5 1/4 1/96( 2 g 10 ms 79 kms ) (1)? (2)? (3) 24(18 ) xOy y T y T T m+q (3ll) P x X Q Q (lO) x 2mgl (1)T E (2) Q (3) t 25(22 ) O51 m m A=1 kg Am B=3 kg B() V0=2 ms c ݧ 2 ?=O5g lO mS (1)AB (2)A C (˧) (3) B A? A A C ? A B A ?

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14A 156 16c 17B 18AB 19D 20AD 21A 22(1)(5 )

(2)30,5O(2 )1850(4 )0.44(2 )2.l5219 (2 ) 23 (1) (2) (3) 24(1)T 410 (2
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(2) P Q Q v= (3) P V0 Q



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(2 )

25(1)AB A C A B

V1=

=1 ms(2 )

(2) A A C A AC s

(3)A C A t B lB A A 3L1

A C AB vl B A A L2

A C AB V2B A A Ls

B A (1 )

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