技师在铸圈焙烧的低温阶段升温过快可能造成
A．铸造不全
B．冷隔
C．砂眼
D．气孔
E．铸件表面粗糙
参考答案：E
-Would you like to see a film with us this evening?
-I’d like to.But I can’t__________the time because I have to finish my composition.[ ]
A．pass
B．take
C．afford
D．spend
BJ-29井架的额定工作负荷（）KN。
A.400
B.500
C.600
D.700
