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阀门安装中,哪种说法错误()。
A、减压阀应垂直安装
B、溢流阀应垂直安装
C、单向阀只能水平安装
D、热动力式疏水阀可在任意位置管道上安装
相关专题: 热动力 单向阀 疏水阀 减压阀
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相关问题推荐
疏水阀的种类较多,有热动力型疏水阀、浮力式疏水阀和热膨胀型疏水阀等。属于热动力型疏水阀的是()。
A、浮球式疏水阀
B、脉冲式疏水阀
C、双金属片式疏水阀
D、热动力式疏水阀
E、吊筒式疏水阀
室内疏水器一般选用( )疏水器。
A分离式
B浮动式
C膨胀式
D热动力式
阀门安装中,哪种说法错误()。
A、减压阀应垂直安装
B、溢流阀应垂直安装
C、单向阀只能水平安装
D、热动力式疏水阀可在任意位置管道上安装
The creative shaping process of a technologist's mind can be seen in nearly every artifact that exists. For example, in designing a diesel engine, a technologist might express individual ways of nonverbal thinking on the machine by continually using an intuitive sense of rightness and fitness. What would be the shape of the combustion chamber? Where should the valves be placed? Would it have a long or short piston? Such questions have a range of answers that are supplied by experience, by physical requirement, by limitations of available space, and not in the least by a sense of form. Some decisions, such as wall thickness and pin diameter, may depend on scientific calculations, but the nonscientific component design remains primary.
Design courses, then should be an essential element of engineering curricula. Nonverbal thinking, a central mechanism in engineering design, involves perceptions, which is the special technique of the artists, not the scientist. Because perceptive processes are not assumed to need "hard thinking", nonverbal thought is sometimes seen as a primitive stage in the development of cognitive processes and inferior to verbal mathematical thought.
If courses in design, which in a strongly analytical engineering curriculum provide the background required for practical problem-solving, are not provided, we can expect to encounter silly but costly errors occurring in advanced engineering systems. For example, early modes of high-speed railroad cars loaded with sophisticated controls were unable to operate in a snowstorm because the fan sucked snow into the electrical system. Absurd random failures that plague automatic control systems are a reflection of the chaos that results when design is assumed to be primarily a problem in mathematics.
In the passage, what is the writer primarily concerned with?
A.Identifying the kinds of thinking that are used by technologists.
B.Stressing the importance of scientific thinking in engineering design.
C.Proposing a new role for nonscientific thinking in engineering.
D.Contrasting the goals of engineers with those of technologists.
混合动力汽车是指同时装备两种动力来源:热动力源与____的汽车。
A.磁动力源
B.电动力源
C.风动力源
D.重力源