A.10s B.20s C.40s D.2min E.3min
A.填膠過(guò)早 B.單體揮發(fā) C.熱處理時(shí)升溫過(guò)快 D.填膠不足 E.熱處理時(shí)間過(guò)長(zhǎng)
A.冠根比為1:1 B.冠根比為1:2 C.冠根比為1:3 D.冠根比為2:3 E.冠根比為2:1