The computer is an useful machine.
举一反三
- The ratio of the work done by the machine _________ the work done on it is called the efficiency of the machine.
- Never attempt to machine a work-piece without first checking the operation of the machine.( )
- The ratio of the work done by the machine ______ the work done on it is called efficiency of the machine. A: against B: to C: with D: for
- Several machine tools are directly controlled by a central computer, this is the _________.
- 中国大学MOOC: We plan to _________ this machine when funds become available sometime in 2015 with an upgraded machine.