Ultrasonic testing has been widely used in the testingofmaterial and products for its simple operation and high reliability.
由于其具有操作简单、可靠性高等特点，在材料和产品的检测中得到了广泛的应用。
2
Testingofmaterial nano-scale mechanics and nano-materials mechanical properties is the important content of nano experimental mechanics.
材料纳观力学特性与纳米材料力学特性的测试是纳米实验力学的基本内容。
3
Designers spent more than one year choosing and testing ideal materials, and finally picked a new kind ofmaterial that can resist the very difficult conditions on the Moon.