已知A、B、C、D、E、F都是短周期的元素,它们的原子序数依次递增.A原子的电子

题型:问答题

问题:

已知A、B、C、D、E、F都是短周期的元素,它们的原子序数依次递增.A原子的电子层数与它的核外电子总数相同,而B原子的最外层电子数是次外层的2倍,C的氢化物可使湿润的红色石蕊试纸变蓝,B和D可以形成两种气态化合物,E原子核外电子总数比B的2倍少1,F在本周期元素中原子半径最小.则:

(1)A、B、C、D、E、F的名称分别是______.

(2)在A至F中任选元素,写出二种含极性键的非极性分子的结构式______,写出一种含非极性键的离子化合物的电子式______.

(3)由B和D组成,且B和D的质量比为3:8的化合物的电子式是______,该物质与E的同周期相邻主族元素的单质反应的化学方程式为______

(4)F单质与E的最高价氧化物的水化物反应的离子方程式为______.

(5)将8g BA4完全燃烧后恢复到室温,放出热量a kJ,写出表示BA4的燃烧热的热化学方程式______.

考点:原子核外电子的排布
题型:问答题

中华人民共和国海关进口货物报关单

预录入编号: 海关编号:

请根据以上资料,选择以下栏目的正确选项:

“项号”栏()。

A.不填

B.03

C.01

D.01(第—行)03(第二行)

题型:问答题

啤酒中高级醇含量过高会造成()和酒精刺激感。

A.苦涩味

B.头痛

C.草味

D.溶剂味

题型: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?

题型:问答题

什么是电子计算机?

题型:问答题

X线片上成人的椎体结核和椎体肿瘤的主要鉴别点,是

A.椎体的破坏程度
B.是否有死骨形成
C.椎旁软组织阴影
D.椎间隙是否狭窄或消失
E.椎体骨质疏松的程度

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