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问题 单项选择题

高锰酸钾法测定钙，是在一定条件下使Ca2＋与C2O42－完全反应生成草酸钙沉淀，经过滤洗涤后，沉淀溶液于热的稀硫酸溶液中，再用KMnO4标准溶液滴定，CaC2O4沉淀形成的适宜PH是（）

A、1.5～2.5

B、3.5～4.5

C、7.5～8.5

D、9.5～10.5

答案

参考答案：B

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.

该合同对于pre-production samples是否可用替代面料制作？
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单项选择题

可用于制备缓、控释片剂的辅料是（）。

A、微晶纤维素

B、乙基纤维素

C、乳糖

D、硬脂酸镁
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