【单选题】Watch this,Mum! I_______________stand on one leg.
【单选题】He attended the party without _______________.
【单选题】Watch this, mum; I ______ stand on one leg.
【单选题】Watch this, Mum; I _______ stand on leg.
【单选题】He came to the dinner without ______ .
【单选题】下列既能抗病毒.又有抗帕金森病作用的药是
【单选题】Watch this, Mum; I ___ stand on one leg.
【简答题】计算平面机构自由度的公式为 ,应用此公式时应注意判断: A. 铰链, B. 自由度, C. 约束。