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  3. A 3D printer cannot make any object on demand like the Star Trek replicators of

A 3D printer cannot make any object on demand like the Star Trek replicators of

游客2024-08-11  17
问题 A 3D printer cannot make any object on demand like the Star Trek replicators of
science fiction. But a growing array of 3D printing machines have already begun 【M1】______
to revolutionize the business of making things in the real world. 3D printers
work by follow a computer’s digital instructions to "print" an object using 【M2】______
materials such as plastic, ceramics and metal. The printing process involve 【M3】______
building up an object one layer at a time until its complete. For instance, 【M4】______
some 3D printers squirt out a stream of heated, semi-liquid plastic that
solidifies as printer’s head moves around to create the outline of each 【M5】______
layer within the object. The instructions use by 3D printers often take the form 【M6】______
of computer-aided design (CAD)files -digital blueprints for making different 【M7】______
objects. That means a person can be design an object on their computer using 【M8】______
3D modeling software, hook the computer up to a 3D printer, and then watch
the 3D printer build the object right in their eyes. Most 3D printers 【M9】______
don’t go beyond the size of household appliances such as refrigerator, but
3D printing could even scale up in size build objects as big as a house. 【M10】______ [br] 【M10】
选项
答案 size∧build一to
解析 (此处缺少to，接动词build成为不定式，做句子的状语，表目的。)
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