Shipbuilding& Clear openings through frames for external single-Leaf doors The door fits flush into its frame. GB/T9910-1988船用外部单扇门门框通孔这门与门框的大小正好合适。
A string that can be passed through a hole in a door for raising the latch from outside. Shipbuilding& Clear openings through frames for external single-Leaf doors 能穿过锁孔从外面支持插销的带子。GB/T9910-1988船用外部单扇门门框通孔
The results show that: the sound insulation of all single-leaf walls will be affected by coincidence effect thereby reducing the sound insulation, but how much of the lower value is not the same. 研究表明:各种单层墙板在隔声中都会受到吻合效应的影响,从而降低隔声量,但降低值的大小却不一样。