A.加快 B.变慢 C.不变 D.缓慢降低
A.F B.A C.P D.B
A.0.4mm～0.5mm B.0.6mm～0.7mm C.0.7mm～0.8mm
A.2～3 B.3～4 C.4～5
A.一级品纯度≧96% B.一级品纯度≧97% C.一级品纯度≧98% D.一级品纯度≧98.5%
A.1000~1200℃ B.985~1000℃ C.985℃
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