A ruler for drawing a cross section line and a dotted line is a multifunctional drawing tool.
剖面线虚线画尺是一种多功能的绘图工具。
The tube connector and "O" shape seal ring of the valve must be kept clean, and the cross section line of the tube connector cannot be painted.
联接管与阀口“O”形密封圈套入处应保持清洁， （见图20） 联接管有剖面线的部位处不能涂油漆。
Therefore, bearings with a large cross-section are provided with several short rollers in a line.
因此，有大截面的轴承具有几个在一条线上的短滚子。
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