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你能帮帮他们吗
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句型转换。 There are different ways of doing this. There are ____________ ways of doing this.
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△ABC中sin2A≤sin2B+sin2C﹣sinBsinC,则A的取值范围为( ).
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Jim likes playing football.And he also likes watching football matches .
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矩形截面简支梁受均布荷载作用,已知 P=6KN, L=4M,b=120mm ,h=180mm,材料的许用应力[σ]=10Mpa,试校核梁的正应力强度。
1年前