Women workers wear hats ______ their hair gets caught in the machine.
举一反三
- The workers are discussing how to ____ the new machine.
- Hui women like to use the color of veils to reflect their status: unmarried young women wear white or other colors of veils; middle-aged women wear red ones, and those over 60 wear black ones.
- If the machine had been cheaper, it might well have ______. A: caught up with B: caught up on C: caught on D: caught out
- 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.( )