【简答题】D More and more age addicts in Korea are refusing to leave their bedrooms and some young s are playing fantasy s online until they literally drop dead. 'He didn't adapt very easily into h...
【判断题】固定端的约束, 可阻止被约束的物体发生任何移动和转动。()
【单选题】物体在没有任何约束的情况下,有( )自由度。
【简答题】若 x 3-x = x 3-x ,则x的取值范围是______.
【判断题】约束反力是约束物体对被约束物体的反力,是限制被约束物体的力。()
【单选题】在指定的叶片径向位置叶片弦线与风轮旋转面的夹角叫:
【判断题】一个物体在空间不加任何约束、限制的话,它有六个自由度。( )
【简答题】若 |x|-3 x 2 -2x-3 的值为零,则x的值是______.
【简答题】若 x 3-x = x 3-x ,则x的取值范围是( ) A.x<3 B.x≤3 C.0≤x<3 D.x≥0