Ceramic tile: use a small hammer knock on to see if free drum sound, groove seam is full, ceramic tile stick whether level off.
瓷砖:用小锤子敲敲看是否有空鼓的声音,沟缝是否饱满,瓷砖贴的是否平整。
2
Beginning one physics teacher:You are 2, absolutely is a rightness of drumhammer of city god temple.
初一物理老师:你们两个,简直是城隍庙的一对鼓锤。
3
The author described philosophy, causes and precautions for water hammer appearance in steam piping, drum, feedwater piping, economizer, drum draining tube, sub-steam cylinder etc.