Human ingenuity was initially demonstrated in
A: the use of machines to produce science fiction.
B: the wide use of machines in manufacturing industry.
C: the invention of tools for difficult and dangerous work.
D: the elite's cunning tackling of dangerous and boring work.
A: the use of machines to produce science fiction.
B: the wide use of machines in manufacturing industry.
C: the invention of tools for difficult and dangerous work.
D: the elite's cunning tackling of dangerous and boring work.
举一反三
- Water wheels are machines that use the energy of ______ to turn a wheel. The axle of the turning wheel can then power other machines to do work.
- Human ingenuity was initially demonstrated in________.
- They _______ tools and machines to help them in their work. A: created B: shifted C: paved D: invented
- ___________use machine tools, such as lathes, milling machines, and machining centers, to produce precision metal parts. A: machinists B: artists C: teachers D: workers
- Different CNC machines tools may use different CNC systems, but the CNC machining program commands are the same.