Improving public malnutrition condition have 3 kinds of channel: adjusting diet structure, employing nutrition supplement and food fortification.
改善营养不良状况有3种途径，即调整饮食结构，进行食物营养强化和使用营养补充剂。
Pa series amplifiers feature 3 kinds of operating states: double-channel, parallel, and bridging. They are selectable according to different situations.
PA系列功放设置三种工作状态：双声道，并联，桥接可以根据不同的场合选用。
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