9. Piano is a popular ____.
A: machine
B: instrument
C: equipment
D: tool
A: machine
B: instrument
C: equipment
D: tool
举一反三
- (3 points) The machining process system includes (). A: machine tool, tool, fixture and workpiece B: worker, tool, fixture and workpiece C: machine tool, tool, worker and workpiece D: machine tool, tool, fixture and worker
- The NC machine tool system contains the machine control unit (MCU) and the （ ） A: Machine B: Machine tool C: NC
- The NC machine tool system contains the machine control unit ________ and the machine tool itself.
- Conventional milling machine tool is ________ from CNC milling machine tool in construction.
- When processing the chamfer of M10 hole, the machine tool and tool are（ ） A: Lathe, 45 ° offset tool B: Vertical drilling machine, countersink