The raw materials of the clinker of Portland cement include（） A.well-grading aggregatesB.mixing clayC.lime-bearing mineralsD.gypsum 正确答案：mixing clay；lime-bearing minerals

glass has many unique characteristics. Considering the structure and properties of glass, the four most significant characteristics are:（）,（）,（）, and the continuity and irreversibility of property change A.brittlenessB.isotropyC.metastabilityD.no fixed melting point 正确答案：isotropy … 阅读详情>> "glass has many unique characteristics. Considering the structure and properties of glass, the four most significant characteristics are:（）,（）,（）, and the continuity and irreversibility of property change"

The multistage fabrication process for advanced ceramics includes（） A.powder productionB.formingC.sinteringD.supercoolingE.drying 正确答案：powder production；forming；sintering；drying

What sets ceramics apart is their set of properties common to nearly all forms.Those properties are（） A.extreme hardnessB.heat resistanceC.corrosion resistanceD.electrical and thermal conductivityE.low ductilityF.brittleness 正确答案：extreme hardness；heat resistance；corrosion resista … 阅读详情>> "What sets ceramics apart is their set of properties common to nearly all forms.Those properties are（）"

Which of the following does not belong to concrete durability.（） A.resistance to freezing and thawingB.thermal shock resistanceC.chloride resistanceD.chemical resistance 正确答案：thermal shock resistance

The strength of concrete is generally expressed in megapascals（MPa）at an age of（）-days. A.7B.27C.28D.30 正确答案：28

（）strength may be defined as the measured maximum resistance of a concrete or mortar specimen to axial loading. A.TensionB.CompressiveC.BendingD.Yield 正确答案：Compressive

The main chemical composition of gypsum is（） A.calcium sulfateB.calcium aluminateC.CaOD.Al2O3 正确答案：calcium sulfate

This may seem strange, but theoretically glass should be very strong because of the nature of its（）bonds. A.ionicB.covalentC.interatomicD.metallic 正确答案：interatomic

One of the most important properties of molten glass is（）, which changes dramatically as the temperature changes. A.glass transition temperatureB.viscosityC.surface tensionD.surface energy 正确答案：viscosity

In amorphous solids, it is believed that the atomic structure of a glass lacks any（）which is evidenced by X-ray diffraction analysis A.long-range translational periodicityB.long-range disorderC.short-range orderD.short-range disorder 正确答案：long-range translational periodicity

Ceramics do not have a（）because they do not plastically deform. A.tensile strengthB.bending strengthC.compressive strengthD.yield strength 正确答案：yield strength