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?

What is the process principle of welding A: laser radiation onto material B: melting of material C: resolidfying of material D: absorption of material

中国大学MOOC: The quantity of material in the material purchases budget is greater than the inferred from quantity of material in the material usage budget. Which of the following statements can be this situation?

If a better material______, the strength of the part would have been in- creased. A: had been used B: had been using C: being used D: using

(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

The stratification of parent material (heterogeneous parent material) has a more complex influence on the material migration and soil fertility, compared with homogeneous parent material. The stratification of parent material will be inherited to soil.

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

中国大学MOOC: When the material absorbs water, the ____ of material will increase?