笔者在讲授《直角三角形全等的判定》时遇到这样一道习题:使两个直角三角形全等的条件是(A)一锐角对应相等(B)两锐角对应相等(C)一条边对应相等(D)两条边对应相等其中(A)和(B)选项显然不对,因为三角形全等必然应该有边对应相等的条件,而(C)选项仅有一条边对应相等又无法确定两个直角三角形的形状。因此,学生们都不假思索地选择了(D)选项, The author encountered the following problem when teaching “Judgment of Right-angled Triangle”: The conditions for congruence between two right-angled triangles are (A) an acute angle corresponds to equal (B) two acute angles correspond to equal (C) (A) and (B) options are obviously wrong, because the triangle congruent inevitably should have the edge corresponding to the same conditions, and (C) the option has only one edge corresponding to the same can not be determined two right triangle shape. As a result, students chose the (D) option without hesitation,