What are the basic sots or strokes in table tennis then?
乒乓球的基本击球方法有哪些？
2
Hard dots Half-tone sots produced either by contact or by direct laser scanning. See Soft dots.
由接触复制或由激光直接扫描而得的半色调点子。参阅软点。
3
In theoretically, the hot spot model of plasma ignition is studied, it can describe the ignition behaviors at a qualitative level and analyze all sots of effects.