关于perforations的百科

• perforations造句怎么写

• Anytapepuncherthatautomaticallytransformsencodedelectricalsignalsintoperforationsonpapertape.Thestyle,withroundperforationsintendedtoflushwaterfromtheshoe,wasinventedpreciselyfortheslosh.Squeezecementingoperationsmaybeperformedtorepairpoorprimaryceme...
• 2017-05-1825904