But low-expansion glass is much costlier than soda-lime glass.
但是低膨胀的玻璃比碱石灰玻璃可贵多了。
2
This paper sums up the cutting, heat treatment of 4. J32 low-expansion alloy applied in a space instrument, analyses the reasons why 4j32 is difficult to be cut.
文中就4j32低膨胀合金在航天遥感器型号产品上的应用和切削加工及热处理进行了综述。
3
This paper introduces the casting precipitation properties, their effects on the alloy microstructure and the methods to eliminate the precipitation of the Low-expansion superalloy GH909. and GH907.