皮皮学，免费搜题
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搜题
【单选题】
画物体受力图的第一A.
确定研究对象
B.
画出隔离体
C.
画出所有已知力
D.
画出所有约束反力
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】Their children are also ______ of developing the disease.
A.
at high risk
B.
at the high risk
C.
on high risk
D.
on the high risk
【简答题】七、介词 / 副词填空: (10%) 1. As is known, people differ _____ one another _____ their ability to treat stress. 2. According _______ an ancient story, a man named Cang Jie invented Chinese writing. 3. _____ m...