They spread a __________ on the ground for the picnic meal, and while they were eating, a rabbit ran out of the wood nearby and darted straight across their dinner.
拍照语音搜题,微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】有A、B两杆,其材料、横截面积及所受的轴力相同,而L A =2L B ,则LA与LB的关系是()。