Which of the following () may not be interested in science and technology
A: The substance facing a resource shortage
B: The substance with an increasing uses
C: The substance whose anthropogenic flow is closely related to other substances
D: None of the above
A: The substance facing a resource shortage
B: The substance with an increasing uses
C: The substance whose anthropogenic flow is closely related to other substances
D: None of the above
D
举一反三
- Which of the following substances is not amphoteric substance? A: H2O B: HCO3- C: H2PO4- D: CO32-
- In the crystals of the following substances, the substance with ionic bonds is ( ). A: SO2 B: SiO2 C: NaCl D: H2O
- Which one of the following suffixes does NOT refer to substance? （ ）.
- The physical properties are those properties of a substance that can be observed with changing the substance into other substances.
- Which of the following substance will be basic? A: CO2 B: NaCl C: Al2O3 D: BaO
内容
- 0
Which of the following substance will be amphoteric? A: CO2 B: NaCl C: Al2O3 D: BaO
- 1
A plastic is a synthetic material which can be molded into any desired shape and which uses an organic substance as a binder.
- 2
which substance in body contains iron?
- 3
To identify a substance, chemists observe two distinct types of , physical and chemical, which are related to physical and chemical that matters undergoes.
- 4
Which is proved that the substance determined by this method is expected, and the index of the substance to be determined () A: Standard curve and quantitative range B: Specificity C: Stability D: Matrix effect