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【单选题】
The word science is heard so often in modern times that almost everybody has some notion of its meaning. On the other hand, its definition is difficult for many people. The meaning of the term is confused, but everyone should understand its meaning and objectives. Just to make the explanation as simple as possible, suppose science is defined as classified knowledge (facts). Even in the true sciences distinguishing fact from fiction is not always easy. For this reason great care should be taken to distinguish between beliefs and truths. There is no danger as long as a clear difference is made between temporary and proved explanations. For example, hypotheses and theories are attempts to explain natural phenomena. From these positions the scientist continues to experiment and observe until they are proved or discredited. The exact statue of any explanation should be clearly labeled to avoid confusion. The objectives of science are primarily the discovery and the subsequent understanding of the unknown. Man cannot be satisfied with recognizing that secrets exist in nature or that questions are unanswerable he must solve them. Toward that end specialists in the field of biology and related fields of interest are directing much of their time and energy. Actually, two basic approaches lead to the discovery of new information. One, aimed at satisfying curiosity, is referred to as pure science. The other is aimed at using knowledge for specific purposes—for instance, improving health, raising standards of living, or creating new consumer products. In this case knowledge is put to economic use. Such an approach is referred to as applied science. Sometimes practical-minded people miss the point of pure science in thinking only of its immediate application for economic rewards. Chemists responsible for many of the discoveries could hardly have anticipated that their findings would one day result in application of such a practical nature as those directly related to life and death. The discoveries of one bit of information opens the door to the discovery of another. Some discoveries seem so simple that one is amazed they were not made years ago however, one should remember that the 'construction of the microscope had to precede the discovery of the cell. The host of scientists dedicating their lives to pure science are not apologetic about ignoring the practical side of their discoveries they know from experience that most knowledge is eventually applied. To define science we may simply call it ______.
A.
the study of unrelated subjects
B.
an attempt to explain natural phenomena
C.
the study of unrelated fields
D.
classified knowledge
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【单选题】船用万能式自动空气断路器是一种具有短路、过载______多种保护的保护电器。
A.
逆功
B.
超速
C.
欠压
D.
低速
【单选题】船用万能式自动空气断路器是一种具有 过载、欠压、_______多种保护的保护电器。
A.
逆功
B.
短路
C.
超速
D.
低速
【多选题】以下关于铁路工程的说法错误的是()。
A.
铁路是为供机车牵引车辆组成的列车循轨道行驶的交通线路,它是将两条截面呈工字形的(钢)铁轨平行固定在轨枕上构成。无需设置路基
B.
钢轨是承受并传递轨道重力及列车动态作用的结构,是轨道的基础
C.
划分地铁与轻轨的依据应是单向最大高峰小时客流量的大小:地铁的客流量为 3-6 万人次,轻轨的客流量为 1-3 万人次
D.
地铁平面曲线半径不小于 300 米,而轻轨一般在 100 米到 200 米之间
【单选题】船用万能式自动空气断路器既是一种具有短路、过载、欠压多种保护的保护电器,又是一种______的开关电器。
A.
频繁操作
B.
不允许操作
C.
反复操作
D.
非频繁操作
【单选题】下列关于公路快速客运基本特征的说法中 错误 的是
A.
客流量大是具备高密度发车的前提条件
B.
具备高速铁路网
C.
具备高速客车和良好的道路通行条件
D.
优质的运输服务
【单选题】下列关于铁路货物运价的说法中,错误的是( )。
A.
国家铁路货物运营价格,针对不同运输形式分为整车货物运价和零担货物运价两类
B.
铁路建设基金,用于铁路基础设施建设
C.
国家铁路新路新价全路均摊运费,专项用于部分新改建铁路项目还贷
D.
国家铁路货运电力附加费,用于弥补电价上涨造成的铁路运输成本增支
【单选题】根据2018年政府工作报告,下列关于今年基础设施投资说法错误的是_____
A.
铁路投资7320亿元
B.
公路水运投资1.8万亿元左右
C.
水利在建投资规模达到1万亿元
D.
机场投资达到4000亿以上
【判断题】船用万能式自动空气断路器是一种具有 逆功、过载、欠压多种保护的保护电器。
A.
正确
B.
错误
【单选题】下列关于铁路货物运价的说法中,错误的是()。
A.
铁路建设基金,用于铁路基础设施建设
B.
国家铁路新路新价全路均摊运费,专项用于部分新改建项目还贷
C.
国家铁路货运电力附加费,用于弥补电价上涨造成的铁路运输成本增支
D.
杂费是针对货物的不同运输条件对在一般作业环节中占用铁路劳务、设施的补偿
【单选题】根据我国《医疗机构管理条例》的规定,下列选项中不属于医疗机构的是?
A.
某大学医务室
B.
妇幼保健院
C.
某中医学院
D.
专科疾病防治所
E.
急救站
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