举一反三
- 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. A: 正确 B: 错误
- Soil fertility is soil productivity, which refers to the ability of soil to produce plant products.
- Soil radiation is the only source of soil heat.
- The role of trees is to______. A: loose soil B: keep soil in position C: harden soil D: Both A and B
内容
- 0
Soil age refers to the length of time for soil development. Soil age is usually divided into absolute age and relative age.
- 1
At the moment of applying load on saturated cohesive soil, who bears all the stress increase in the soil? A: Soil skeleton B: Pore water C: Both soil skeleton and pore water D: None of the above is true.
- 2
Which of the following compressions in the soil under loading cannot be ignored（） A: soil particles B: interparticle pore C: sealing gas D: water in the soil
- 3
The following statement is correct ().The steeper the curve, the smaller the compressibility of the soil; The greater the compression coefficient, the greater the compressibility of the soil;The greater the compression index, the greater the compressibility of the soil;The greater the compression modulus, the greater the compressibility of the soil A: × √ √ × B: √ × √ × C: √ × × √ D: √ √ √ ×
- 4
Soil bacteria are integral to healthy soil for plants to grow without the use of chemical fertilizers.