When cutting through Yuleishan Mountain, the workers used fire to heat stones and water to cool the rocks to. They applied the principle of thermal _____________ and cold contraction into practice.

Americans continue to lead the world in breakthroughs and _____ scientific discoveries. A: cutting-bit B: cutting-edge C: cutting-through

Cutting parameters include cutting speed, feed and cutting thickness.

The dimension of the cutting layer measured along the machined surface is called （ ） A: cutting depth B: cutting length C: cutting width D: cutting thickness

Among the cutting parameters, the most important factor affecting the cutting temperature is (). A: feed B: cutting speed C: cutting depth D: cutting thickness

Cutting taxes can lower investment through its impact on interest rates. This is an example of the: () A: Income effect. B: Accelerator effect. C: Crowding out effect. D: Multiplier effect.

When selecting cutting parameters, the first choice should be (). A: cutting speed B: feed C: side cutting D: back cutting

Cutting parameters include cutting speed, feed and cutting thickness. A: 正确 B: 错误

Among the cutting parameters ,( ) has the greatest influence on the cutting temperature. A: Cutting speed B: Back engagement of the cutting edge C: Feed D: Feeding speed

Pete was _____________ the lawn around the roses. A: cutting down B: cutting off C: trimming D: cutting short