5 材料在不同的循环特性下,有 可用 图表示。图中 A 、 B 、 S 各点的坐标为 A 、 B 、 S 其对应的循环特征分别为 、 、 。
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【单选题】Choose a right form of the verb "get" in the following sentence from the four given choices below. This leaflet tells you how to avoid _____ ill while travelling.
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