symmetric autooscillations
... symmetric vibration 对称振动 symmetric autooscillations 对称自振 symmetric determinant 对称行列式 ...
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非对称自振汤 non symmetric autooscillations
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桅杆的自振频谱密集，纤绳布置的不对称以及纤绳初应力的不同，使得弯扭振动为桅杆的主要振动。
The natural frequencies of the mast is very close; twisted vibration is the major vibration mode for the asymmetry of the guys layout and the difference of the guys' initial stress.
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