Fats and fixed oils are greasy or waxy substance that ill their pure state are normally tasteless, colorless, and odorless.（）
A: or
B: substance
C: their
D: normally
A: or
B: substance
C: their
D: normally
举一反三
- Most pure oils are odorless and light yellow (colorless).
- Polycarbonate (PC) has the characteristics of colorless, odorless, tasteless, nontoxic, high strength, impact strength, etc.
- When<br/>the substance is measured by atomic absorption spectrophotometry, the<br/>state of the substance is ( ) A: Solid<br/>state B: Liquid C: Vapor<br/>state D: Supercritical<br/>state
- 3. It's not a pure substance, () it is made of different substances.
- A pure substance always has the same physical and chemical properties and is either an element or a compound.。（ ）