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I was doing my homework while my parents were ______ (cook)dinner.
1年前
如图,点E,A,C在同一条直线上,AB∥CD,AB=CE,AC=CD.求证:BC=ED.
1年前
短文改错。 If someone asks you how you can make you always happy
1年前
图示外伸梁承受集中载荷Fp作用,尺寸如图所示。已知Fp= 20kN,许用应力[σ] = 160 MPa,试选择工字钢的号码。
1年前
已知sin^3x+cos^3x=1,求sinx+cosx的值与sin^4x+cos^4x的值
1年前