根据销售合同审核信用证，指出信用证存在的问题并说明如何修改。
(1)销售合同

(5)装运期限：
TIME OF SHIPMENT: SHIPMENT TO BE EFFECTED BEFORE FEB.28, 2007
(6)装运港：
PORT OF LOADING: QINGDAO CHINA
(7)目的港：
PORT OF DESTINATION: KOBE JAPAN
(8)分批装运:
PARTIAL SHIPMENTS: NOT ALLOWED
(9)转船：
TRANSSHIPMENT: NOT ALLOWED
(10)付款条件：
TERMS OF PAYMENT: THE BUYER SHALL OPEN THROUGH A BANK ACCEPTABLE TO THE SELLER AN IRREVOCABLE SIGHT LETTER OF CREDIT WHICH REMAINS VAUDFOR NECOTIATLON IN CHINA UNTIL THE 15TH DAY AFTER THE DATE OF SHIPMENT.
(11)保险：
INSURANCE: TO BE COVERED BY THE BUYER.
(12)REMARKS: 5% MORE OR LESS LN QUANTITY AND AMOUNT IS ALLOWED.
Confirmed by：
买方 高岛 卖方 洪坡
THE BUYER THE SELLER
(2)信用证
2006 DEC25 15:55:52 LOGICAL TERMINAL P005
MT700 ISSUE OF A DOCUMENTARY CREDIT PAGE 00001
RUNC SWPR3
UMR 001 82387
MAGACK DWS765 1 AUTH OK, KEY B19604214FAEA982, BKCHCNBJ SAIB JPJT RECORD
BASIC HEADERF 01 BKCHCNBJA300 81 18 157214
APPLICATION HEADER 0 700 1547 061225 SAIBJPJTCXXX 3846 992024 050225 1447
*ASAHI BANK LTD, ＜FORMERLY THE
*KYOWA SAIYAMA BANK. LTD. ＞
*TOKYO
USER HEADER SERVICE CODE 103:
BANK PRIORITY 113:
MSG USER REF. 108:
INFO. FROM CI 115:
SEQUENCE OF TOTAL *27 : 1/1
FORM OF DOC, CREDIT *40 : REVOCABLE
DOC, CREDIT NUMBER *20 : LC-788-392328
DATE OF ISSUE *31C : 061225
EXPIRY *31D : DATE 070215
PIACE IN THE COUNTRY OF THE APPUCANT
APPLICANT *50 SAKULAN CO., LTD.
ITC BUILDINC 6TH FLOOR SUITE 602 1-8-4
CHOME ISOBE-DORI CHUO-KU KOBE JAPAN
BENEFICIARY *59 QINGDAO HUANXING IMP. ＆EXP. CO., LTD.
NO.1005 ZHONGSHAN ROAD(E.1),
QINGDAO CHINA
AMOUNT *32B : CURRENCY USD AMOUNT 123000,00
MAX. CREDIT AMOUNT *39 : UP TO
AVAILABLE WITH/BY *41D : ANY BANK
BY NEGOTIATION
DRAFTS AT... *42C : DRAFTS AT SIGHT FOR FULL INVOICE
VALUE
DRAWEE *42A :
*ASAHI BANK LTD, ＜FORMERLY THE
*KYOWA SAIYAMA BANK, LTD. ＞
*TOKYO
PARTIAL SHIPMENTS *43P : NOT ALLOWED
TRANSSHIPMENT *43T : ALLOWED
LOADING IN CHARGE *44A : SHIPMENT FROM CHINESE PORT(S)
FOR TRANSPORT TO... *44B : TO TOKYO, JAPAN
LATEST DATE OF SHIP. *44C : 070130
DESCRIPT. OF GOODS *45A :
(1)MAN’S BELT 3100PCS @ USD12.00
1)MATERIAL: PU
2)SIZE 100×4.8CM
3)OUTER PACKING: 150PCS/CTN
(2)FASHION BELT 4800PCS @ USD15.00
1)SIZE: 105×8CM
2)MATERIAL: PU, NEEDLE BUCKLE
3)OUTER PACKING: 120PCS/CTN
(3)DIAMANTE BELT 550PCS @ USD30.00
1)SIZE: 105×3.8CM
2)MATERIAL: METALLIC PU WITH NEEDLE BUCKLE
3)OUTER PACKING: 100PCS/CTN
PRICE TERM: CIF
DOCUMENTS REQUIRED *46A
+3/3 SET OF ORIGINAL CIEAN ON BOARD OCEAN BILLS OF LADING MADE OUT TO ORDER OF SHIPPER AND BLANK ENDORSED, MARKED "FREIGHT PREPAID" AND NOTIFY APPLICANT
+ORIGINAL SIGNED COMMERCLAL INVOICE IN 5 FOLD INDICATING CONTRACT NO.
+INSURANCE POLICY OR CERTIFICATE, ENDORSED IN BLANK, FOR 110PCT OF THE INVOICE VALUE
INCLUDING: THE INSTITUTE CARGO CLAUSES(A), THE INSTITUTE WAR CLAUSES AND THE INSTITUTE STRIKES, RIOTS AND CIVIL MOTIONS CLAUSES, INSURANCE CLAIMS TO BE PAYABLE IN JAPAN
+CERTIFICATE OF ORIGIN IN 1 ORICINAL AND 1 COPY.
+PACKING LIST IN 3 FOLD
+WEIGHT LIST IN 3 FOLD
ADDITIONAL COND. *47
1．T.T. REIMBURSEMENT IS PROHIBITED.
2．10PCT MORE OR LESS IN QUANTITY ACCEPTABLE.
3．THE COODS TO BE PACKED IN STRONG EXPORT CARTONS.
DETAILS OF CHARGES *71B ALL BANKING CHARGES OUTSIDE JAPAN INCLUDING REIMBURSEMENT COMMISSIONS ARE FOR ACCOUNT OF BENEFICIARY.
PRESENTATION PERIOD *48 DOCUMENTS TO BE PRESENTED WITHIN 5 DAY AFTER THE DATE OF SHIPMENT, BUT WITHIN THE VALIDITY OF THE CREDIT.
CONFIRMATION *49 : WITHOUT
INSTRUCTIONS *78:
THIS CREDIT IS NON-OPERATIVE UNLESS THE OPENING BANK GIVE FURTHER ADVISE.
THE NECOTIATION BANK MUST FORWARD THE DRAFTS AND ALL DOCUMENTS BY REGISTERED AIRMAIL DIRECT TO US (INT’L OPERATIONS CENTER MAIL ADDRESS:C.P.O.BOX NO. 800 TOKYO 100-91 JAPAN) IN TWO CONSECUTIVE LOTS, UPON RECEIPTOF THE DRAFTS AND DOCUMENTS IN ORDER, WE WILL REIMBURSE THE NEGOTIATINGBANK IN ACCORDANCE WITH THEIR INSTRUCTIONS.
TRAILER : ORDER IS ＜MAC: ＞ ＜PAC: ＞ ＜ENC: ＞ ＜CHK: ＞ ＜TNG: ＞
MAC: 3CDFF763’
CHK: 8A1AA1203070

在渠道糙率、底坡和过水断面积不变条件下，水力最佳断面不正确的概念为（）。

A．通过流量最大

B．过水断面湿周最小

C．过水断面水力半径最小

D．过水断面水力半径最大