单项选择题
多道程序设计是指: A.
在一台处理机上同一时刻运行多个程序; B.
在实时系统中并发运行多个程序 ; C.
在分布系统中同一时刻运行多个程序; D.
在一台处理机上并发运行多个程序;
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有以下程序 #include main() { FILE *f; f=fopen("filea.txt","w"); fprintf(f,"abc"); fclose(f); }若文本文件filea.txt中原有内容为:hello,则运行以上程序后,文件filea.txt中的内容为( )
A、abclo
B、abc
C、helloabc
D、abchello
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在良好的路面上行驶时,越野胎比普通胎耐磨。
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下列基准物质可以用于标定盐酸溶液浓度的是____?
A、邻苯二甲酸氢钾
B、碳酸钙
C、碳酸钠
D、重铬酸钾
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因为利润和剩余价值在量上相等,所以剩余价值率同利润率相等。
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Directions: Read the following claim and choose the best evidence to support it.
Nuclear plants require lots of water. __________
A、One cannot look at only the nuclear power plant, but has to consider the whole process of producing electricity. The other processes such as mining, milling, refining and enrichment require energy input which may be carbon-based. The construction and decommissioning are also both energy-intensive processes. All of these may contribute to global warming.
B、Nuclear power plants are only 35% thermally efficient. This means for every kilowatt of electricity produced, almost twice as much waste heat is generated. Nuclear plants require water to remove the waste heat—usually into the environment.
C、The efficient use of natural resources is a major criterion in determining the environmental friendliness of a source of energy. Nuclear energy extracts by far more energy from the natural resource Uranium than does the exploitation of oil or any other natural resource. It is the most efficient use of the Earth’s resources. In fact a gram of uranium can generate as much electricity as four tons of coal.
D、Nuclear waste can be properly managed and stored with virtually no risks to society. There are very clear ways to effectively manage and store nuclear waste. All concerns related to this process relate to human error. If properly managed, all of these concerns can be addressed and all significant risks eliminated. Experience so far has been that this is a low risk process.
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According to the text, what can be said about the function of teeth?
A、They are only used for specific purposes.
B、They make food smaller so it can be swallowed.
C、They are used to tear up food quickly.
D、They crush up food to make it small.
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体量修正完成后,就要把前半部的可视造型线(parking-line)依照尺寸投影到模型上。
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毒品问题一直困扰着哥伦比亚。
A.对
B.错
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霍尔式凸轮轴位置传感器故障诊断描述错误的是( )
A、输出波形为幅度大于4.5V的矩形波
B、发动机运转时输出信号端电压有明显变化
C、不能用电压测量法进行故障判断
D、信号输出端动态电压为2.6V左右
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目前,我国无砟轨道有长枕埋入式、弹性支承块式和板式3种类型。
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