Modern concrete blends are reinforced with steel fibers and __________ for strength and to prevent cracking.( )
A: water reducing fibers
B: water condesation polymers
C: water tower
D: water reducing polymers
A: water reducing fibers
B: water condesation polymers
C: water tower
D: water reducing polymers
举一反三
- 中国大学MOOC: There is no magic wand to suddenly eliminate water scarcity. But there are concrete ways to ________water shortages.
- What water is used in the production of injection A: pure water B: purified water C: water for injection D: sterile water for injection
- According to the distribution of oil, gas and water, the water at the edge of containing edge is called (). A: External water B: Bottom water C: Edge water D: Edge bottom water
- Which one is not the common source of injection water: A: surface water B: ground water C: distilled water D: oil polluted water
- The best irrigation water is river water, pond water and lake water A: 正确 B: 错误