自由基对DNA的氧化损伤机制研究已经有一定深度，主要研究有（）。
参考答案：活性氧对碱基的损伤、活性氧造成DNA断裂
图中a、b是两个点电荷，它们的电量分别为Q1、Q2，MN是ab连线的中垂线，P是中垂线上的一点．下列哪种情况能使P点场强方向指向MN的左侧？（ ）
A．Q1、Q2都是正电荷，且Q1＜Q2
B．Q1是正电荷，Q2是负电荷，且Q1＞|Q2|
C．Q1是负电荷，Q2是正电荷，且|Q1|＜Q2
D．Q1、Q2都是负电荷，且|Q1|＞|Q2|
报关单查错题1 某加工贸易企业申报进口备案料件一批
备案情况1：
备案情况2
GLORY OCEANIC CO.,LTD Room xxx,Wing Fu Bldg,xxx wing Kut Street ,HongKong TEL:(852)2581 xxxx FAX: (852)2581 xxxx INVOICE & PACKING LIST报关员考试报名 Invoice No.: Go-1000125 Date:12-MAR-2010 CONTRACT NO: 2009/47465 MESSRS: DONGGUAN JOUSHEN FURNITURE CO., TD,DONGGUAN,CHINA FROM HO CHI MNH,VIEHAM TO YANTIAN,CHINA
TOTAL: 39BUNDLES 50800 50300 74.45 HKD 175914.40 TOTAL: COUNTRY OF ORIGIN: CIETNAM
致：____________港区、场、站 收货人：/通知人：东莞侨兴家具有限公司 下列货物已办妥手续、运费结清，准予交付收货人
BILL OF LADING
PARTICULARS DECLARED BY SHIPPER BUT NOT ACKNOWLEGED BY THE CARRIER
CONTAINER NO. 5EAL NO. SIZE MOVEMENT PKG OOLU8087642 /AUS0636 /40HQ/FCL/FCL 20 PALLETS OOLU8732134 /AUP9230 /40HQ/FCL/FCL 19 PALLETS TOTAL NO. OF CONTAINERS/PACKAGES RECEIVED & ACKNOWLEDGED BY CARRIER FOR THE PURPOSE OF CALCULATION OF PACKAGE LIMITATION( IF APPLICABLE):2 CONTAINERS/PACKAGES(S) DESITINATION CHARGES COLLECT PER LINE TARIFF. AND TO BE COLLECTED FROM THE PARTY WHO LAWFULLY DEMANDS DELIVERY OF THE CARGO. SHIPPER LOAD AND COUNT,CONTAINER(S) SEALED BY SHIPPER TOTAL NO.OF CONTAINERS OR PACKAGES (IN WORDS):
请根据以上资料，找出本报关单栏目中的5项错误。 中华人民共和国海关进口货物报关单
备案情况1：
备案情况2
GLORY OCEANIC CO.,LTD Room xxx,Wing Fu Bldg,xxx wing Kut Street ,HongKong TEL:(852)2581 xxxx FAX: (852)2581 xxxx INVOICE & PACKING LIST报关员考试报名 Invoice No.: Go-1000125 Date:12-MAR-2010 CONTRACT NO: 2009/47465 MESSRS: DONGGUAN JOUSHEN FURNITURE CO., TD,DONGGUAN,CHINA FROM HO CHI MNH,VIEHAM TO YANTIAN,CHINA
TOTAL: 39BUNDLES 50800 50300 74.45 HKD 175914.40 TOTAL: COUNTRY OF ORIGIN: CIETNAM
致：____________港区、场、站 收货人：/通知人：东莞侨兴家具有限公司 下列货物已办妥手续、运费结清，准予交付收货人
BILL OF LADING
PARTICULARS DECLARED BY SHIPPER BUT NOT ACKNOWLEGED BY THE CARRIER
CONTAINER NO. 5EAL NO. SIZE MOVEMENT PKG OOLU8087642 /AUS0636 /40HQ/FCL/FCL 20 PALLETS OOLU8732134 /AUP9230 /40HQ/FCL/FCL 19 PALLETS TOTAL NO. OF CONTAINERS/PACKAGES RECEIVED & ACKNOWLEDGED BY CARRIER FOR THE PURPOSE OF CALCULATION OF PACKAGE LIMITATION( IF APPLICABLE):2 CONTAINERS/PACKAGES(S) DESITINATION CHARGES COLLECT PER LINE TARIFF. AND TO BE COLLECTED FROM THE PARTY WHO LAWFULLY DEMANDS DELIVERY OF THE CARGO. SHIPPER LOAD AND COUNT,CONTAINER(S) SEALED BY SHIPPER TOTAL NO.OF CONTAINERS OR PACKAGES (IN WORDS):
请根据以上资料，找出本报关单栏目中的5项错误。 中华人民共和国海关进口货物报关单 