Passage
A: Bricks.
B: A mixture of rock and soil.
C: Concrete.
D: Steel.
A: Bricks.
B: A mixture of rock and soil.
C: Concrete.
D: Steel.
举一反三
- Under a certain long-term load, concrete would creep. In the reinforced concrete axial compressive members: A: Creep increases the compressive stress of concrete. B: The compressive stress of concrete and steel bar keeps unchanged. C: Creep decreases the compressive stress of concrete and increases the compressive stress of steel bar. D: Creep increases the compressive stress of concrete and decreases the compressive stress of steel bar.
- Passage A: By containers made by concrete. B: By containers made by steel. C: By using reservoirs formed by dirt walls. D: By using reservoirs formed by wood.
- High-speed steel is also___________________(know) as self-hardening steel.
- Ploughing mainly has the function of turning over soil, loosening soil and breaking soil.
- Ploughing mainly has the function of turning over soil, loosening soil and breaking soil.