Professor Thring's mechanical coal miner ______.
A: has already been seen by the Coal Board
B: is his first invention
C: looks like a TV camera
D: is not yet in production
A: has already been seen by the Coal Board
B: is his first invention
C: looks like a TV camera
D: is not yet in production
举一反三
- What particular advantage does Professor Thring's coal miner have A: It does not have to go deep underground. B: It can work in very narrow spaces. C: It can work in the open air. D: It is twice as strong as a human miner.
- In recent years ( ) has seen the largest increase of any country in coal consumption.
- The invention of this new machinery will _________________ the coal industry.
- ___certain that his invention will lead to the development of production A: That is B: This is C: It is D: It has
- Coal is most used for the electricity production in()and().