下列几种运动中的物体,可以看作质点的是 ( ) A.从广州飞往北京的飞机 B.绕

题型:选择题

问题:

下列几种运动中的物体,可以看作质点的是 (      )

A.从广州飞往北京的飞机

B.绕地轴做自转的地球

C.一枚硬币用力上抛,猜测它落地时正面朝上还是反面朝上

D.在平直公路上行驶的汽车

考点:质点
题型:选择题

根据以下10个乘积,回答问题:

11×29;12×28;13×27;14×26;15×25;16×24;17×23;18×22;19×21;20×20。

(1)试将以上各乘积分别写成一个“□2-○2”(两数平方差)的形式,并写出其中一个的思考过程;

(2)将以上10个乘积按照从小到大的顺序排列起来;

(3)试由(1)、(2)猜测一个一般性的结论。(不要求证明)

题型:选择题

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题型:选择题

中华人民共和国货币制度建立于()

A、1948年

B、1949年

C、1950年

D、1951年

题型:选择题

建设项目管理的工作内容包括项目策划和项目控制,从管理主体的角度,建设项目管理分为(),不同管理主体的项目管理的目标和任务是不同的。

A.监理方项目管理

B.设计方项目管理

C.施工方项目管理

D.供货方项目管理

E.业主方项目管理

题型:选择题

下列哪位不是“三曹七子”中的人物?()。

A、曹操

B、曹丕

C、曹错

D、曹植

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