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其中DDRAM用于指定显示字符的位置，只需将需要显示的字符送至相应的DDRAM地址即可在屏幕上显示.
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CGRAM用于由用户自定义字模，而CGROM则已经内置了123个常用字模，包括ASCII码、日文假名和希腊字母。
Trading on the basis of the actual quality of the goods available is called ( )
In international trade, it is difficult to set uniform standards for certain agricultural and sideline products whose quality varies greatlyMethods of showing quality are commonly used ( )
In international trade, the way to express the quality of technical products is ( ).
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