等效替代法是科学研究中常用的方法之一，是在保证某种效果（特性和关系）相同的前提下，将实际的、复杂的物理问题和物理过程转化为等效的、简单的、易于研究的物理问题和物理过程的方法．力的合成、力的分解、平均速度、瞬时速度这四个物理名词中，采用等效替代方法的有 （　　）

A．l种

B．2种

C．3种

D．4种

一、已知资料

LOADING PORT: TIANJIN

DESTINATION: MONTREAL PORT

PARTIAL SHIPMENT: PROHIBITED

TRANSSHIPMENT: PROHIBITED

PAYMENT: L/C AT SIGHT

INSURANCE: FOR 110 PERCENT OF THE INVOICE VALUE COVERINC ALL RISKS AND WAR RISK

TIME OF SHIPMENT: LATEST DATE OF SHIPMENT MAR. 16, 2009

THE BUYER:THE SELLER:

DANGYV CORPORATIONTIANJIN IMPORT & EXPORT TRADE CORPORATION

杰克赵蕊

2．信用证通知书：

3．信用证：

SEQUENCE OF TOTAL*27: 1/1

FORM OF DOC. CREDIT*40A: IRREVOCABLE

DOC. CREDIT NUMBER*20: 33416852

DATE OF ISSUE31C: 090112

DATE AND PLACE 0F EXPIRY*31D: DATE 0903 17 PLACE IN THE COUNTRY OF BENEFICIARY

APPLICANT*50: DANGYV CORPORATION

88 MARAHALL AVE

DONCASTER VIC 3108, MONTREAL CANADA

ISSUING BANK52A: NATIONAL BANK

99, CCC AVE

MONTREAL CANADA

BENEFICIARY*59: TIANJIN TOOL IMPORT & EXPORT TRADE CORPORATION

1312 HUAYUAN ROAD

TIANJIN, CHINA

AMOUNT*32B: CURRENCY USD AMOUNT 12500.00

AVAILABLE WITH/BY*41D: ANY BANK IN CHINA

BY NEGOTIAION

DRAFTS AT… 42C: DRAFTS AT SICHT

FOR FULL INVOICE COST

DRAWEE 42A: NATIONAL BANK

PARTIAL SHIPMENTS 43P: PROHIBITED

TRANSSHIPMENT 43T: PROHIBITED

LOADING ON BOARD44A: TIANJIN

FOR TRANSPORTATION TO… 44B: MONTREAL PORT

LATEST DATE OF SHIPMENT 44C: 090316

DESCRIPT OF GOODS45A: COTTON BLANKET

ART NO. H666500 PCS USD 5.50/PC

ART NO. HX88500 PCS USD 4.50/PC

ART NO. HE21500 PCS USD 4.80/PC

ART NO. HA56500 PCS USD 5.20/PC

ART NO. HH46500 PCS USD 5.00/PC

DOCUMENTS REQUIRED 46A: +SIGNED COMMERCIAL INVOICE IN TRIPLICATE.

+PACKING LIST IN TRIPLICATE

+CERTIFICATE OF ORIGIN CSP CHINA FORM

A, ISSUED BY THE CHAMBER 0F COM-

MERCE OR OTHER AUTHORITY DULY ENTI-

TLED FOR THIS PURPOSE.

+3/2 SET OF CLEAN ON BOARD OCEAN

BILLS OF LADING, MADE OUT TO ORDER OF

SHIPPER AND BLANK ENDORSED AND

MARKED "FREICHT PREPAID" AND NOTIFY

APPLICANT.

+FULL SET OF NEGOTIABLE INSURANCE

POLICY OR CERTIFICATE BLANK ENDORSED

FOR 110 PCT OF INVOICE VALUE COVERING

ALL RISKS AND WAR RISK

CHARGES71B: ALL BANKING CHARGES OUTSIDE CANADA

ARE FOR ACCOUNT OF BENEFICIARY.

PERIOD FOR PRESENTATION 48: DOCUMENTS MUST BE PRESENTED WITHIN

15 DAYS AFTER THE DATE OF SHIPMENT

BUT WITHIN THE VALIDITY OF THE CREDIT.

4．补充资料

(1)INVOICE NO. : XH096671

(2)INVOICE DATE: FEB. 01, 2009

(3)PACKING

G. W: 20.5KGS/CTN

N. W: 20KGS/CTN

MEAS: 0.2CBM/CTN

PACKED IN 250 CARTONS OF 10 PCS EACH

PACKED IN TWO 20’ CONTAINER(集装箱号：TEXU2263999；TEXU2264000)

(4)H. S. CODE: 5802.3090

(5)VESSEL: NANGXING V.086

(6)B/L NO. : COCS0511861

(7)B/L DATE: FEB. 26, 2009

(8)POLICY NO. : SH098812

(9)REFERENCE NO. : 20090819

(10)FREIGHT FEE: USD 1100

(11)INSURANCE FEE: USD 1000

(12)注册号：7895478966

(13)证=污号：580511478

(14)报检单编号：896541231

(15)报检单位登记号：1254789479

(16)生产单位注册号：12345Q

(17)投保单编号：TB0562311

(18)金发编号：JF417707

(19)人民币账号：RMB061222

(20)外币账号：WB84815229

(21)海关编号：7896866423

(22)境内货源地：天津

(23)生产厂家：天津毛巾厂

(24)天津进出口贸易公司海关注册号：0387124666

二、根据上述相关资料缮制下列单据

1．商业发票：

TEL: 022-65788877INV NO: ______

FAX: 022-65788876 DATE: ______

S/C NO. : ______

I/C NO: ______

TO:

FROM ______ TO ______

TOTAL AMOUNT:

WE HEREBY CERTIFY THAT THE CONTENTS OF INVOICE HEREIN ARE TRUE AND CORRECT.

TIANJIN IMPORT & EXPORT TRADE CORPORATION

× × ×

2．装箱单：

TEL: 022-65788877INV NO. : ______

FAX: 022-65788876 DATE: ______

S/C NO. : ______

TO：MARKS & NOS

3．汇票：

4．普惠制产地证明书申请书和普惠制产地证明书

(1)普惠制产地证明书申请书：

申请单位(加盖公章)： 证书号：

申请人郑重申明： 注册号：

本人被正式授权代表本企业办理和签署本申请书。

本申请书及普惠制产地证明书格式A所列内容正确无误，如发现弄虚作假，冒充格式A所列货物，擅改证书，自愿接受签发机构的处罚并承担法律责任。现将有关隋况申报如下：

(2)普惠制产地证书：

5．出境货物报检单：

报检单位(加盖公章)： *编号：______

报检单位登记号： 联系人： 电话： 报检日期： 年 月 日

6．投保单和保险单

(1)投保单：

编号：______

兹我处出口物资依照信用证规定拟向你处投保国外运输险计开：

(2)保险单：

中 国 人 民 保 险 公 司

THIS POLICY OF INSURANCE WITNESSES THAT PEOPLE’S INSURANCE OF CHINA

(以下简称本公司)

(HEREIN AFTER CALLED THE COMPANY)

根 据

AT THE REQUEST OF

(以下简称被保险人)的要求，由被保险人向本公司缴付约

(HEREIN AFTER CALLED THE INSURED) AND IN CONSIDERATION OF THE AGREED

PREMIUM PAID TO THE COMPANY

定的保险费，按照本保险单承保险别和背面所载条款与下列

BY THE INSURED UNDERTAKES TO INSURE THE UNDERMENTIONED GOODS IN

TRANSPORTATION SUBJECT TO THE

特款承保下述货物运输保险 ， 特立本保险单。

CONDITIONS OF THIS POLICY AS PER THE CLAUSES PRINTED 0VERLEAF AND OTHER SPECIAL CLAUSES ATTACHED HEREON。

保险金额：

TOTAL AMOUNT INSURED: ______

保费 费率 装载运输工具

PREMIUM AS ARRANGED RATE AS ARRANGED PER CONVEYANCE S. S: ______

开航日期 自 至

SLG. IN OR ABT. ______ FROM ______ TO ______

承保险别：

CONDITIONS: ______

所保货物，如遇出险，本公司凭保险单及其他有关证件给付赔

CLAIMS, IF ANY, PAYABLE ON SURRENDER OF THIS POLICY TOGETHER WITH

OTHER RELEVANT DOCUMENTS. IN THE EVENT OF

偿。所保货物，如果发生本保险单项下负责赔偿的损失或事故，

ACCIDENT WHEREBY LOSS OR DAMAGE MAY RESULT IN A CLAIM UNDER THIS POLICY IMMEDIATE NOTICE APPLYING FOR SURVEY MUST

应 立 即 通 知 本 公 司 下 属 代 理 人 查 勘 。

BE GIVEN TO THE COMPANYS AGENT AS MENTIONED HEREUNDER。

中国人民保险公司天津分公司

THE PEOPLE’S INSURANCE TIANJIN BRANCH

赔偿地点

CLAIM PAYABLE AT ______

日期

DATE______

地址：中国天津花园路23号TEL: 323405 3217464-44 TELEX: 33128 PICCS SN.

Address: 23 HUAYUAN ROAD TIANJIN, China Cable 42001 Tianjin

General manager

7．海运货物委托书和海运提单

(1)海运货物委托书：

(2)海运提单：

8．出口货物报关单：

9．装运通知：