One of the most important properties of molten glass is（）, which changes dramatically as the temperature changes.
A.glass transition temperature
B.viscosity
C.surface tension
D.surface energy
正确答案：viscosity
One of the most important properties of molten glass is（）, which changes dramatically as the temperature changes.
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The strength of concrete is generally expressed in megapascals（MPa）at an age of（）-days.
This may seem strange, but theoretically glass should be very strong because of the nature of its（）bonds.
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