蒸馏生产要求控制压力在允许范围内稳定,大幅度波动会破坏()。
A、生产效率
B、产品质量
C、气-液平衡
D、不确定
参考答案:C
---Helen is a thoughtful girl. --- Yes. I think she is _____ plan everything well.
A.too talented to
B.talented enough to
C.so talented that
D.Both B and C
斜刺法的进针角度是()
A.15°左右
B.30°左右
C.45°左右
D.70°左右
E.90°左右