Might is a modal verb and its place on the level of possibility scale is somewhere in the middle between definite and impossible.
“可能”是一个情态动词，其可能性大小处于确定和不可能之间。
For large scale free structure with very great weight, such as a large and heavy-duty launch-vehicle, the free-free modal test is realized difficultly.
对于大型自由结构，如大型运载器，要实现自由状态下的模态试验是愈来愈困难了。为此，人们被迫只好对这类结构进行约束状态下的模态试验。
The modal identification and excitative selectiion for large scale construction machinery are analyzed in this paper, and the proposed method has been used in enginnering practice.
本文介绍了大型建筑机械的试验模态分析法，对各激振方式的特点进行了分析，提出适用于大型建筑机械的激振方式并将其用于实践。
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