下面哪些不是转炉终点钢水含氧量的影响因素()。
A.终点碳含量
B.碱度
C.渣中(FeO)含量
D.温度
参考答案:B
引起持续性枕后位、枕横位的病因包括()。
A.骨盆异常
B.头盆不称
C.羊水过少
D.胎头俯曲不良
E.子宫收缩过强
Under the CIF Term,the risk of loss of or damage to the goods is transferred from the seller to the buyer when the goods pass the ship's mail in the( ).
A.port of discharge
B.port of delivery
C.port of destination
D.port of shipment