- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
紅外熱熔焊的焊接時間為（）
A.20-30s
B.20-40s
C.30-40s
D.20-80s
A.20-30s
B.20-40s
C.30-40s
D.20-80s
