whichone is not trace mineral?()
A: zinc
B: copper
C: magnesium
D: iodin
A: zinc
B: copper
C: magnesium
D: iodin
举一反三
- which elements belong to micro-elements？（ ） A: iron B: sodium C: zinc D: magnesium
- Grey spot of oat are due to A: Copper B: Iron C: Manganese D: Zinc
- Which of the following is the most abundant solid mineral in the seabed?( ) A: Manganese nodule B: Nickel ore C: Copper mine D: Cobalt ore
- Rate the following cements in terms of compressive strength from highest to lowest A: A. zinc oxide-eugenol, zinc phosphate, resin B: B. zinc phosphate, resin, zinc oxide-eugenol C: C. resin, zinc phosphate, zinc oxide-eugenol
- [img=54x23]17de8084fc8189f.png[/img]的英文名称是_______。 A: magnesium nitride B: nitrogen fixation C: magnesium nitrogen D: nitric acid