【简答题】A.applauding B.assessing C.ascending D.adjusting
【单选题】下列骨折基本X线表现,其中哪一项错误? ( )
【简答题】衡量材料的塑性性质的主要指标是( )和( )。
【简答题】Describe the procedures of adjusting derricks.
【简答题】我们把图中所有顶点加上遍历时经过的所有边构成的子图称为 ___ 。
【单选题】We are adjusting this project to meet the clients’ needs . (就划线部分提问)
A.
Why do we are adjusting this project to meet the clients’ needs?
B.
What are you adjusting this project to meet the clients’ needs?
C.
Why are you adjusting this project ?
【简答题】设a,b为常矢,r=xi+yJ+zk,r=|r|,证明 (1)▽(r.a)=a; (2)▽.(ra)= (r.a); (3)▽×(ra)= (r×a); (4)▽×[(r.a)b]=a×b; (5)▽(|a×r|2)=2[(a.a)r-(a.r)a]. [提示:利用拉格朗日恒等式:(a×b).(c×d)=(a.c).(b.d)-(a.d)(b.c).]