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【简答题】

Smith Sports Equipment P.O.Box 1014 Tulsa, Oklahoma 74109—1014 Phone 918 555-12 Fax 918 555-0170 September 21, 2002 Mr. Michael Trigg 17 Westwood Place Quincy, MA 02171 Dear Mr. Trigg, Thank you for writing to us on September 15th about the trouble you experienced with our model 191 fishing reel(线轴) and for sending the reel to us for examination. We are sorry to hear about the difficulties you had with the release button. We have examined your reel and found the problem. It seems that a retaining pin(针) on the button spring was pushed into the side of the reel casing(包装), thereby it inoperable(不可操作的). The retaining pin is a vital yet delicate part of your reel. In order to make it function properly, it must be pushed gently. Since the pin was damaged by misuse, we are not able to refund(退还) your purchase price. We will be pleased, however, to repair your reel for $9.98 and return it to you for more hours of fishing pleasure. Please let us know your decision. I look forward to hearing from you soon. Respectfully, Ralph Montoya, Manager of Customer Relations Department When did Mr. Trigg write to the manager about the reel he bought? On ______.

题目标签:可操作线轴操作
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参考答案:
举一反三

【多选题】梯度pH萃取法分离的正确操作是

A.
总碱溶于酸水,加碱碱化,每碱化一次则氯仿萃取一次,碱化pH由低到高,生物碱依由弱到强分出
B.
总碱溶于酸水,加碱碱化,每碱化一次则氯仿萃取一次,碱化pH由低到高,生物碱依由强到弱分出
C.
总碱溶于氯仿,酸水萃取,酸液pH由低到高,生物碱依由弱到强分出
D.
总碱溶于氯仿,酸水萃取,酸液pH由高到低,生物碱依由弱到强分出
E.
总碱溶于氯仿,酸水萃取,酸液pH由高到低,生物碱依由强到弱分出

【单选题】绿色环保是化学实验的追求,下列操作不会引起空气污染的是

A.
用浓盐酸洗涤加热KMnO4制氧气的试管
B.
用稀硝酸洗涤做过银镜实验的试管
C.
硝酸亚铁和硫酸废液一同倒入废液缸
D.
将打破的水银温度计插入硫粉中

【多选题】有关铂皿使用操作正确的是()

A.
铂皿必须保持清洁光亮,以免有害物质继续与铂作用;
B.
灼烧时,铂皿不能与其他金属接触;
C.
铂皿可以直接放置于马弗炉中灼烧;
D.
灼热的铂皿不能用不锈钢坩锅钳夹取。
相关题目:
【多选题】梯度pH萃取法分离的正确操作是
A.
总碱溶于酸水,加碱碱化,每碱化一次则氯仿萃取一次,碱化pH由低到高,生物碱依由弱到强分出
B.
总碱溶于酸水,加碱碱化,每碱化一次则氯仿萃取一次,碱化pH由低到高,生物碱依由强到弱分出
C.
总碱溶于氯仿,酸水萃取,酸液pH由低到高,生物碱依由弱到强分出
D.
总碱溶于氯仿,酸水萃取,酸液pH由高到低,生物碱依由弱到强分出
E.
总碱溶于氯仿,酸水萃取,酸液pH由高到低,生物碱依由强到弱分出
【单选题】绿色环保是化学实验的追求,下列操作不会引起空气污染的是
A.
用浓盐酸洗涤加热KMnO4制氧气的试管
B.
用稀硝酸洗涤做过银镜实验的试管
C.
硝酸亚铁和硫酸废液一同倒入废液缸
D.
将打破的水银温度计插入硫粉中
【多选题】有关铂皿使用操作正确的是()
A.
铂皿必须保持清洁光亮,以免有害物质继续与铂作用;
B.
灼烧时,铂皿不能与其他金属接触;
C.
铂皿可以直接放置于马弗炉中灼烧;
D.
灼热的铂皿不能用不锈钢坩锅钳夹取。
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