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问题 选择题

水在通电时生成氢气和氧气，在此反应中，水、氢气和氧气的质量比为

A．1：2：3

B．2：1：3

C．1：8：9

D．9：1：8

答案

答案：D

电解水的化学方程式为：2H2O  2H2↑+O2↑，由电解水的化学方程式可知，水、氢气和氧气的质量比为：36：4：32=9：1：8．

故选D．

点评：本题主要考查化学方程式的含义，解答时要特别注意反应条件、质量守恒定律等方面的问题．

填空题

游戏的公平性是指双方获胜的概率（    ）
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单项选择题

For each blank, choose the best answer from the four choices and write down on the answer sheet.

It is claimed that Al applications have moved from laboratories to the real world. However, conventional von Neumann computers are (1) for Al applications, because they are de- signed mainly for numerical processing. In a larger yon Neumann computer, there is a larger ratio of memory to processing power and consequently it is even less efficient. This (2) remains no matter how fast we make the processor because the length of the computation becomes dominated by the time required to move data between (3) and memory. This is called the yon Neumann (4) . The bigger we build the machines, the worse it gets. The way to solve the problem is to diverse from the traditional architectures and to design special ones for Al applications. In the research of future Al architectures, we can take advantages of many (5) or currently emerging concepts. in computer architecture, such as dataflow computation, stack machines, tagging, pipelining, systolic array, multiprocessing, distributed processing, database machines, and inference machines.

3（）

A．calculator

B．controller

C．memory

D．processor
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