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【简答题】
You must answer this question. 1. Your English friend, Bill, is a travel writer and he recently visited a town which you know well. He has written a chapter about the town for a guide book and you have just read the chapter. Read the extract from Bill's letter and your notes. Then, using all your notes, write a letter to Bill, giving him the information and suggestions he needs. Thanks for agreeing to check the chapter that I've written. Could you let me know what you liked about it? If any of the information is inaccurate, please give me the correct information! Do you think there's anything else I should include? Once again, thanks a lot for reading the chapter Please write back soon. Bill Notes for Bill Tell Bill what I liked about his chapter—places to visit .... Give Bill correct information about —parking in city centre —museum opening times Suggest Bill include —map —nightlife (give Bill details) Write a letter of between 120 and 180 words in an appropriate style. Do not write any postal addresses.
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皮皮学刷刷变学霸
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【简答题】读取 Northwind.txt 文本数据到 DataFrame 。 (1) 查询出 Konbu 产品数据 (2) 查询出 Tofu 产品数据 (3) 求解上述两个产品的平均售价、销售量 (4) 计算 Konbu 和 Tofu 两个产品的相关系数。 (5) 计算 Konbu 和 Tofu 两个产品的协方差。
【简答题】已知H2S的K1=1×10-7,K2=1×10-14。则0.1mol/L H2S溶液中 C(H+) =()mol/L,C(S2-) =()mol/L;0.1mol/L H2S+0.1mol/L HCl溶液中C(H+) =()mol/L,C(S2-) =()mol/L,ZnS(Ksp=1.0×10-24)在该溶液中的溶解度s =()mol/L。0.1mol/L Na2S溶液的pH =()
【简答题】(本小题2分) 在1mol×L-1HCl溶 液中用FeCl3溶液滴定SnCl 2 溶液,此反应的平衡常数是____ 。( 已 知 , )
【简答题】当两物体的接触面光滑无摩擦时，称为 ____ 。 [填空(1)]A. 光滑接触面
【简答题】读取 Northwind.txt 文本数据到 DataFrame 。 (1) 查询出在 1997 年 3 月份销售过的产品名称。 (2) 求解销售相关性最强的两个产品。 (3) 求解销售业绩波动最小的产品。
【单选题】当深度游标尺校正时,发现0没有对交,而是游标上4和主尺上对齐(如图),若用此深度游标尺测量一槽深出的结果是12.40mm时,则此槽的实际深度是()
A.
12.00mm
B.
12.40mm
C.
12.80mm
D.
12.04mm
【简答题】列举出自己所了解的与网络安全相关的知识。
【简答题】当两物体的接触面光滑无摩擦时，称为 ____ 。 [填空(1)]A. 光滑接触面
【单选题】已知 HCl 标准溶液的浓度是 0.1000 mol × L -1 ,则该 HCl 标准溶液对 Na 2 CO 3 的滴定度 为
A.
0.005300 gmL-1
B.
0.01060 gmL-1
C.
0.1000 gmL-1
D.
0.02000 gmL-1
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