A: high melting point
B: poor plasticity
C: low hardness
D: solid conductive
E: liquid non-conductive
举一反三
- In an ionic solid, positive and negative ions are bound in the lattice by ionic bonding forces.
- When the solid fat index is below 5%, the proportion of liquid fat in the fat is too high, the fat is too soft, and the plasticity is not good.
- Which of the following is NOT an advantage of steel? A: Formability B: Joinability C: Paintability D: Repairability E: Low melting point
- Ionic bonding is formed by ( ) A: valence electron transfer B: shared electron pair C: free electron and cation D: attraction of the electric dipoles
- Which of the following are characteristics of the steel structure? A: High strength and low weight B: Good plasticity and toughness C: Easy to manufacture and construct D: Weak corrosion resistance
内容
- 0
Which of the following is NOT an example of primary bonding? A: Van der Waals B: ionic C: covalent D: metallic
- 1
Ionic bonded materials are characterized by the following properties except . A: hard B: brittle C: conductor D: high melting temperature
- 2
Which are corrrect for choosing proppant A: for low permeability formations,the fracture mainly is requires to increases the length B: for low permeability formations,the fracture mainly is requires to increases fracture conductivity C: for medium or high permeability formations,the fracture mainly is requires to increases the length. D: for medium or high permeability formations,the fracture mainly is requires to increases fracture conductivity.
- 3
Moderate drinking is conducive to your health whereas excessive drinking is detrimental to your health.句中,conducive 和 detrimental的意思是_______. A: beneficial; deteriorating B: beneficial; harmful C: conductive;degenerative D: conductive; devastating
- 4
Which is the superordinate of the following group of words? A: matter B: liquid C: gas D: solid