After synthetic ( ), engineers had a better choice of material.
举一反三
- After the project, the engineers immediately started a new one A: completed B: has completed C: had been completed D: has been completed
- After marriage, you had better go on a ______. A: moon B: river C: mountain D: honeymoon
- After marriage,you had better go on a . A: moon B: river C: montain D: noneymoon
- 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.
- The main raw material of wood-based panels is wood or no-wood plant fiber material.