• 2021-04-14
    Master Wu teaches us ___ the machine.
  • how to run

    内容

    • 0

      The ratio of the work done by the machine _________ the work done on it is called the efficiency of the machine.

    • 1

      Never attempt to machine a work-piece without first checking the operation of the machine.( )

    • 2

      There is nothing in the world ______ teaches us some lessons.00a0

    • 3

      Don’t worry! It ____ us half an hour to fix the machine.

    • 4

      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