singleadj.单一的；单个的；特指某人或某物；单身的；单人的；单程的n.单程票；单曲；单人房间；单身者；<美>一元纸币；(网球)单打比赛；(板球)一分打；(棒球)一垒打v.挑选(一个)single clock单一时钟脉冲

1. There are many affecting factors about the squareness of two-point press, of which the synchronous movement of the cranks is the main one.
   摘要影响双点压力机垂直度的因素有多种，其中曲柄运动的同步性是影响压力机精度的主要因素，也是较难解决的问题。