which elements belong to micro-elements?
举一反三
- which elements belong to micro-elements？（ ） A: iron B: sodium C: zinc D: magnesium
- Which of the following choice does not belong to the main elements in communication process?
- Which of the following does not belong to the dental elements? A: dentine B: enamel C: cement D: dental pulp
- Decide which elements are essential:
- Which of the following are the elements of communication?