单词：periodical variation
periodical variation的用法和样例：
例句
- Variations in the properties of the weld occurring at short regular intervals along the weld line due to repetitive variation in welding heat.由于焊接热量周期变化，使得沿焊缝线每一固定的小间距焊缝的性能出现周期性变化。
- Parametric rolling is a kind of the resonance phenomena of ship motions, caused by the periodical fluctuations of stability parameters of ships in waves.参数横摇是指船舶在波浪中由于自身系统中稳性参数的周期性变化所引起的船体梁横摇共振运动现象。
单词：periodical variation 相关文章
spill inadequate poll stern stability litter commend industrious establish dazzle frequency tower detain periodical appreciable verse cylinder prick glitter yeast kinetic luminous accommodate propagate
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Pre-Listening Vocabulary fascinate: to cause great interest mature: to grow periodical: reoccurring at specific times droves: large numbers brood: a group of living things that are hatched or born at the same time emerge: to come out; to appear overl
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