corrugated sheet-iron (undulated sheet-iron)

nickel-plated steel sheet and nickel-plated punched steel sheet

sheet to sheet duplicator

single sheet apparatus for measuring specific total losses of magnetic sheet and strip

a back answer

abbreviated answer

acoustic coupler， auto-answer modem

analysis answer

answer

answer back

answer back check

answer back code

answer back code generation

answer back key

answer back mechanism

answer back memory

answer back message

answer back sarcastically

answer back signal