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1.在数学活动课上,老师让同学们判断一个 四边形门框是否为矩形.下面是某合作学习小组 4位同学拟定的方案,其中正确的是() (A)测量对角线是否互相平分. (B)测量两组对边是否相等. (C)测量一组对角是否都为直角. (D)测量其中三个角是否都为直角. 2.已知力F对一个物体所做的功是1
1. In the math activity class, the teacher asked the students to judge whether a quadrilateral frame was rectangular. The following is a scheme developed by 4 students in a cooperative learning group. The correct one is () (A) Measure whether the diagonal lines are evenly divided. (B) Measure whether two opposite sides are equal. (C) Measure whether a set of diagonals are all right-angled. (D) Measure whether all three corners are right-angled. 2. Known force F. The work done on an object is 1