The machine is in operation.
举一反三
- The machine is ___________ . A: in operate B: in operation C: in common
- Never attempt to machine a work-piece without first checking the operation of the machine.( )
- The machine is in operation。（ ） A: 这台机器正在运作。 B: 这台机器在手术中。
- The ___________ of a big new machine can be hard to learn. A: operate B: operation C: operating D: operative
- Before operation the machine, you should read the contents in the _______.( ) A: warning labels B: cell phone C: textbook D: computer