Since it is now______to build the complex central processing unit of a computer on a single silicon chip using photolithography

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问题 Since it is now______to build the complex central processing unit of a computer on a single silicon chip using photolithography and chemical etching, it seems plausible that other miniature structures might be fabricated in______ways.

选项 A、difficult...related
B、permitted...unique
C、mandatory... congruent
D、routine... similar

答案D

解析 句意:因为用影印石板术和化学蚀刻技术在一块胶片上制造复杂的计算机中央处理器已经是家常便饭,所以其他的微结构能够运用类似的方法制造似乎也成为可能。routine普通的,习惯性的。mandatory强制的。congruent适合的。
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