What should be inserted into the machine
举一反三
- What is this?(machine)
- If the machine should ______, call this number immediately.
- The machine should (test) ______ before it is put to use.
- Before operating the machine, we should carefully study the operator’s manual of a CNC machine tool.
- To use the machine, first______ the correct coins, then select the drink you want and press the button A: inserted into B: inserting C: insert D: insert into