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问题 选择题

点P（3，-4）关于y轴对称的点的坐标是（   ）

A．（-3，-4）

B．（3，4）

C．（3，-4）

D．（-3，4）

答案

答案：A

题目分析：点关于y对称，则有y轴的坐标不变，x轴的坐标互为相反数，故该点的坐标是（-3，-4），故选A

点评：本题属于对点的基本坐标的考查和运用，其中关于y轴对称和关于x轴对称的基本性质就是关于哪个轴对称，则该点的对称坐标不变，其他的互为相反数

解答题

爸爸的平均步长是0.75米，小娟的平均步长是0.5米，从小娟家到街心公园爸爸走了240步，小娟要走多少步？（用比例方法解答）
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问答题

根据以下业务背景资料，回答（一）～（五）题的相关问题。2010年7月1日，上海进出口贸易公司（SHANGHAI IMPORT AND EXPORT CO., LTD.）与澳大利亚客户（MANDARS IMPORTS CO.,LTD）签订了一份出口女式牛仔裙（.Ladies Denim Skirt）的合同（合同号为PU20107），并指派外贸跟单员小王负责此笔业务跟单合同的主要内容如下：Fabric & Construction : 99% cotton 1% polyester with spandex 11S ×16S +70D/88×46 Washing: Stone washed Packing: Flat pack, 1 piece/polybag1 dozen into a big polybag, assorted sizes per polybag, 4 big polybags into an export carton. Export carton must be p. Maximum sizes of export cartons: Length Width Heightcm 60 42 48 ColourBlue/grey Shipping mark of the cartons As per our information Hangtag: MANDARS Main label: MANDARS Washing label: With correct compositon & washing instruction Samples: Pre-production samples: 3 pieces in size 38 before 15th July,2010（ETD Shanghai）by DHL The pre-production samples should be made after the fabric has been tested and passed by STR Shanghai Branch, （上海胜邦质量检测分公司）then will be sent to customer’s quality assurance department. “GO” for production can only be given after their approval. Lab Dip samples:as confirmed by our assurance quality department on 5th July,2010 Shipping samples: 2 pieces in size 38 on/about 5 days after shipment Payment: 30 % deposit with order by T/T, the balance against copy of B/L Price terms & total amount: USD 8.00 per piece FOB Shanghai, USD144000.00 Quantity: 18000 pieces, size and color assortment:

5% more or less in the quantity and amount are allowed. Shipment: 20th August, 2010 from Shanghai to Sydney, Australila by COSCO as carrier , partial and transshipment allowed Shipping agent: Shipment should be made by Shanghai Jingde Int’l Forwarding Co.,Ltd.. Tel86-21-62228123，AttnMr.Liu Purchase conditions: All garments manufacturers must meet the minimum manufacturing standards, comply with the SA8000 and all garments should be AZO-free and no nickel in press buttons is used.

外贸跟单员小王为了证明所采购的纸箱达到了我国出口标准和澳大利亚客商的“export carton must be p”要求，可以采用什么简易方法予以检验？
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