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The thermal conductivity of materials has a varied relationship to temperature.
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更多“The thermal conductivity of ma…”相关的问题
For example: The hardness of ceramics is greater than metals. Thus, the comparison is expressed as ceramics ＞ metals. (2pts)
Thermal expansion: A)
From the above comparison, B) ______ have the lowest CTE and C) ______ have the weakest bonding forces among the aforementioned materials.
Which ofthe following comparison is not correct？
A) Thermal conductivity: metal ＜ plastics
B) Thermal expansion: metal ＞ plastics
C) Density: metal ＞ plastics
D) Thermal conductivity: metal ＞ plastics
A．Electronmicroscope
B．Opticalmicroscope
C．X-ray diffraction (XRD)
D．Differential thermal analysis (DTA)
______ is not the advantage ofpolymer matrix composites.
A) Decrease in thermal expansion and creep rate.
B) Increase in impact strength and dimensional stability.
C) Containing a good balance of properties
D) Environmental degradation is greater than that experienced by either component material alone.
Compared to amalgam，resin composites have all ofthe following advantages except()
A．low thermal conductivity
B．esthetics
C．high early strength
D．a self-sealing mechanism
Which is not the advantage of Carbon/Carbon composites？
A) Stronger at high temperatures than at low temperature.
B) Easy oxidation at high temperature
C) High specific strength
D) Good resistance to thermal shock.
Which statement is false concerning the objectives of applying coupling agent onto fiber？
A．To protect the fiber surface from damage and bind fibers together for ease of processing.
B．To lubricate the fibers for less abrasion during subsequent processing operations.
C．To impart thermal and electric conductivity.
D．To provide a chemicallink between the fiber surface and the matrix and improve the bonding at the interface.
