该设备依据入选矿物比重差和在往复不对称运动并呈倾斜的床面横向水流中的分层性能进行选别。具有不同比重矿物在床面上分带明显，精矿质量高，操作和调节方便等特点。
The device is based on the proportion of selected minerals deviation and asymmetry in the reciprocating movement and tilt of the bed was horizontal flow in layered performance of sorting.
在所有的前屈肌中，对称性的和不对称的胸锁乳突肌是主要的前屈肌，并且，他们在颈椎的运动中，承担着主动肌、平衡肌和拮抗肌的作用。
In all flexion activities, symmetrical or asymmetrical sternocleidomastoids were the major flexor muscles, and they had to balance the mechanics of the neck as agonists, synergists, or antagonists.
不对称结构在风荷载作用下，将引起平移和扭转的耦合运动。
Under the action of wind loading, motion coupled with translation and torsion will occur for unsymmetrical structures.
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