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1年前
There is _________ news about this movie star in the newspaper. Where can I get some? [ ]
1年前
Wildwood School Library Guide This will offer you some information about our school library.
1年前
如图,闭合开关,测得R1两端电压U1= 12V,求电源电压是多少V?
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