参考答案:
A number of people have posted their own videos on the website You Tube, ____________their attempts to become “musicians”.
A.to show
B.showing
C.showed
D.show
如果界址点已经测有解析坐标,则界址点相对于邻近地物点的关系距离勘丈数量( )。
A.要适当增加 B.保持不变C.可酌情减少 D.可适当增加或减少