利用直角规沿工件边缘划数条垂直线，以使用（）角规最适合。
A.整体双刀口
B.整体单刀口
C.整体平口
D.组合式台座型
参考答案：D
对生产流程前一阶段企业的并购，即并购供应商，这种并购属于纵向并购中的（）。
A、混合并购
B、下游并购
C、上游并购
D、上下游并购
By using MP3，a 600M-byte music CD can be (71) to 50M bytes or less．It can be streamed(downloaded in chunks)so that you can begin listening to the opening bars while the (72) ofthe life arrives in the background。And most important，MP3 music files retain good listening (73) that (74) compression schemes lacked．That (75) of features makes accessing anddistributing music on the Web practical for the first time．
A．pressed
B．compressed
C．compress
D．press
