短周期元素A、B、C、D、E的原子序数依次增大,A与D、C与E位于同一主族。D原

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问题:

短周期元素A、B、C、D、E的原子序数依次增大,A与D、C与E位于同一主族。D原子的内层电子总数是其最外层电子数的2.5倍,且D 的原子序数为A、C原子序数之和。下列叙述中正确的是(  )

A. BC2、DC2、EC2的化学键类型和晶体类型都相同

B. AC2、AE2分子中所有原子最外层都满足8电子稳定结构

C.液态化合物AE2在足量氧气中燃烧,气体体积减少(相同状况)

D.EC2通入BaCl2溶液无任何现象,继续通入BC2也无沉淀生成

考点:构成物质的粒子—分子、原子、离子元素周期律
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塑料废弃物约占我国城市生活垃圾的5%~14%,它造成的“白色污染”已成为社会的一大公害.下列综合整治“白色污染”的各种措施中,不可取的是(  )

A.热分解或熔融再生利用

B.直接填埋或向海里倾倒处理

C.积极寻找纸等纤维类制品代替塑料

D.开发研究可降解塑料

题型:选择题

颅脑手术后,病人头部翻转过剧可引起()

A.硬膜外血肿

B.颅内压增高

C.脑梗死

D.脑出血

E.脑疝

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利用下列实验装置完成相应的实验,能达到实验目的的是(     )

题型:选择题

Sue Parsons, CFA, works full-time as an investment advisor for the Malloy Group, an asset management firm. To help pay for her children’s college expenses, Parsons wants to engage in independent practice in which she would advise individual clients on their portfolios. She would conduct these investment activities only on weekends. Which of the following statements about Standard Ⅳ (A), Loyalty to Employer, is most accurate Standard Ⅳ (A):()

A. precludes Parsons from entering into an independent competitive activity while still employed by Malloy.

B. does not require Parsons to notify Malloy of preparing to undertake independent practice under the current conditions.

C. requires Parsons to notify Malloy in writing about her intention to undertake an independent practice.

题型:选择题

下列有关Java语言的叙述中,正确的是______。

A.Java是不区分大小写的

B.源文件名与public类型的类名必须相同

C.源文件名其扩展名为.jar

D.源文件中public类的数目不限

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