【单选题】Drunken driving — sometimes called American's socially accepted form. of murder — has become a national 【C1】______ Every hour of every day about three Americans on average are killed by drunken driver...
【简答题】机构具有确定运动的条件是 。 a. 自由度数目>原动件数目; b. 自由度数目<原动件数目; c. 自由度数目=原动件数目 2 、图 1-5 所示两构件构成的运动副为 。 a. 高副; b. 低副 3 、如图 1-6 所示,图中 A 点处形成的转动副数为 个。 a. 1 ; b. 2 ; c. 3
【简答题】阅读理解。 Drunken driving-sometimes called America's socially accepted form of murder-has become a national epidemic (流行病). Every hour of every day about three Americans on average are killed by drunken d...