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V-grooves must be opened between the splicing boards. The V-grooves should be opened from both sides of the PCB. Under normal circumstances, the V-grooves should be opened by 1/3 on both sides of the PCB, i.e. If the thickness of the board is 1.6 mm, the depth of the V-grooves on both sides of the board should be 0.53 mm;;[Investigation] Beibadao Group's Manipulation Reveals Secrets: Artificially Creating "Liquidity Vortex" to Grab Huge Profits本意，是找长帆……现在不急了。(2) Ships limited to draft shall fully consider their special conditions and drive with special care.Among them, covering theory, gas theory, endotherm theory and catalytic dehydration theory are usually applicable to cellulose fibers, while droplet theory and absorption of free radicals are applicable to synthetic fiber fabrics.In fact, it is similar to putting all the functions and methods of the page in an array, then traversing the array, in turn