下列属于由于食物链受到破坏而造成农作物减产的原因是[ ] A.不合理使用农药 B

题型:选择题

问题:

下列属于由于食物链受到破坏而造成农作物减产的原因是[ ]

A.不合理使用农药

B.特大的水灾

C.酸雨的危害

D.大量捕捉青蛙,使害虫大量繁殖

考点:动物在自然界中的作用
题型:选择题

周初分封制的实行,巩固了统治,开拓了疆域,但后期却造成了分裂割据。导致这些不同结果的最主要原因是

A.分封诸侯的争权夺利

B.周王室的腐败衰落

C.生产力的迅速发展

D.奴隶、平民起义的打击

题型:选择题

当上颌窦出现较小穿孔时,正确的处理方法是()

A.用碘仿纱条填塞穿孔部位

B.彻底搔刮穿孔部位

C.用0.09%生理盐水冲洗创口

D.嘱患者捏鼻用力鼓气,以确定穿孔位置和大小

E.让血块机化堵塞穿孔

题型:选择题

读中国地理区域示意图,完成下列要求:

(1)在相应横线上填写图中字母代表的地理区域名称:

A______B______C______D______

(2)A、B、C、D四个区域中,人口密度最小的是______,以水田为主的耕地主要是位于______(用字母表示)

(3)B与D的分界线是:______和______.

(4)北京市所在的区域是______,广州所在的区域是______(用字母表示).

题型:选择题

美国生产电脑需8个工作日,生产汽车需9个工作日,则()。

A.美国在生产电脑上有绝对优势

B.美国在生产汽车上有绝对优势

C.美国在生产电脑上有比较优势

D.美国在生产汽车上有比较优势

题型:选择题

For nearly ten years, the Unified Modeling Language (UML) has been the industry standard for visualizing, specifying, constructing, and documenting the (106) of a software-intensive system. As the (107) standard modeling language, the UML facilitates communication and reduces confusion among project (108) The recent standardization of UML 2.0 has further extended the language’s scope and viability. Its inherent expressiveness allows users to (109) everything from enterprise information systems and distributed Web-based applications to real-time embedded systems. The UML is not limited to modeling software. In fact, it is expressive enough to model (110) systems, such as workflow in the legal system, the structure and behavior of a patient healthcare system, software engineering in aircraft combat systems, and the design of hardware. To understand the UML, you need to form a conceptual model of the language, and this requires learning three major elements: the UML’s basic building blocks, the rules that dictate how those building blocks may be put together, and some common mechanisms that apply throughout the UML.

A.investors

B.developers

C.designers

D.stakeholders

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