你可能感興趣的試題

A.45°
B.-45°
C.135°
D.225°

A.當(dāng)且僅當(dāng)δi=1時引起的與δj相應(yīng)的桿端力
B.當(dāng)且僅當(dāng)δj=1時引起的與δi相應(yīng)的桿端力
C.當(dāng)δj=1時引起的與δi相應(yīng)的桿端力
D.當(dāng)δi=1時引起的與δi相應(yīng)的桿端力

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