Ma Jun designed and made many kinds of machines .
举一反三
- Ma Jun, a Great Musician in ancient China.
- Chain pump was invented by Ma Jun in the Three Kingdoms period.
- 1.“Ma Jun was not a talker, but a thinker.”means Ma is (a )____ . A: talker B: thinker C: a talker and a thinker D: neither of them
- Machines have _____________ human labor in many industries.
- With numerical control machines, many of complex problems ________.