The average distribution grade of iron in the earth's crush is 5%, and it has no mining value.
举一反三
- The average distribution grade of iron in the earth's crush is 5%, and it has no mining value. A: 正确 B: 错误
- Permanent magnetism is caused by（）. A: operation of electrical equipment and generators on board ship B: the earth's magnetic field affecting the ship's hard iron during construction C: the horizontal component of the earth's magnetic field acting on the horizontal soft iron D: the vertical component of the earth's magnetic field acting on the vertical soft iro
- It’s imperative that a graduate student maintains an average grade of “A” in his major subjects.
- According to the report, the rise of the earth's average surface temperature is attributed to some natural reasons.
- It’s imperative that a graduate student maintains an average grade of “A” in his major subjects. A: 正确 B: 错误