题目内容
c语言有34种运算符和15个等级的运算优先顺序。
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c语言比汇编程序生成的目标代码效率高。
A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components. PCBs form an essential part of any electronics equipment these days.
The PCB design and layout forms an integral part of the design of the whole electronic product, and it can be the key to the success of the product meeting its performance requirements in many instances.
In the early days of PCBs, the design and layout was undertaken manually. Nowadays the PCB design process has been computerized and there are many PCB CAD softwares that enable the PCB layout and design to be undertaken more efficiently than before.
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