甲午中日战争期间，尽管欧美列强之间矛盾重重，欧洲已经开始形成_爱下问搜题

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问题选择题

甲午中日战争期间，尽管欧美列强之间矛盾重重，欧洲已经开始形成两大对立的军事侵略集团，但他们都不同程度的支持或纵容日本侵略中国，其主要目的是

A．压制中国人民革命

B．扩大各自的在华利益

C．缓和一战前夕在远东地区的形势

D．共同支配中国

答案

答案：B

影响外交政策的主要因素是国家利益。欧洲各国的主要目的是为了各自的国家利益，都支持或纵容日本侵略中国。故选择B。

填空题

若抛物线y=2x²-4x+1与x轴两交点分别是（x₁，0），（x₂，0），则x₁²+x₂²=______．

单项选择题

An analog signal’s characteristic quantity representing data may 66) . at any instant, any value within a continuous (67) . For example, an analog signal may follow continuously the values of another physical quantity representing data.

A discrete signal is composed of (68) elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform, (69) , and position in time. A digital signal is a special case of discrete signals, in which data are represented by a (70) number of well-defined discrete values that one of its characteristic quantities may take in time.

（66）处填（）。

A．acquire

B．collect

C．assume

D．fetch