The most common exogenous pigment is carbon
举一反三
- Which elements is not one of the three most common ones in a plant? A: Carbon B: Hydrogen C: Oxygen D: Sulfur
- Carbon dioxide ______ from burning fuels is the most common of the so-called greenhouse gases. A: producing B: having been produced C: to be produced D: produced
- A common symptom of carbon monoxide poisoning is （ ）
- Radio, television and press were _____ means of broadcasting news before the Internet emerged. A: the most three common B: most three common C: the three most common D: the three the most common
- Of the more common elements(元素) are hydrogen, oxygen, carbon, iron, copper, etc.