It is especially pointed out that ignoring the effect of coupling the base frame and the foundation with the mast will lead to errors that are not acceptable in engineering.
强调指出，在这种振动分析中忽略底座与地基对井架振动的耦合作用，将导致工程上不允许的误差。
DESCRIPTIVE GEOMETRY is the base of engineering Graphics. This course is also the foundation of other graph expression courses for the students majoring in engineering.
《画法几何》是工程图学的基础，也是工程专业学习其它图形表达课程的基础课。
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