What is the process principle of welding
A: laser radiation onto material
B: melting of material
C: resolidfying of material
D: absorption of material
A: laser radiation onto material
B: melting of material
C: resolidfying of material
D: absorption of material
举一反三
- An opaque material is （） A: a material that can be seen through B: a translucent(半透明的) material C: a material that can not be seen through D: a lucent material
- The cost of materials for product A are as follows. Material W: $2,250 Material X: $3,000 Material Y: $3,600 Material Z: $150 If the material proportions were displayed on a pie chart, how many degrees would material Y represent?
- (The more) kinetic (energy in) the particles of (a material), the (hottest) the material is.（） A: The more B: energy in C: a material D: hottest
- The material flow can be divided into the following ( ) two categories according to whether the material flow is mainly caused by human activity A: Material biogeochemical flow and its anthropogenic flow B: Material flowing with the atmosphere and with the water body C: Material industrial and agricultural flows D: Material industry flow and consumption flow
- 5.1 The cost of materials for product A are as follows. Material W:$2,250 Material X:$3,000 Material Y:$3,600 Material Z:$150 If the material proportions were displayed on a pie chart, how many degree would material Y represent ? A: 144 degree B: 90 degrees C: 120 degree D: 204 degree