The frequency-centered SLA theory claims that input frequency is an essential factor affecting L2 acquisition order and determining the productability of language constructions.
Results The difference values calculated were various with the arch form, the sequence was oval, round, parabola, catenuliform, and hyperbola from big difference to smell.
Book sewing machine is one kind of book binding machines, by which the gathered signatures in paginal order from the collecting machine can be sewed to from book blocks.