吹炼中期脱碳反应激烈，（ΣFeO）含量往往较低，易发生炉渣（）现象。
参考答案：返干
If they have to share______apartment with______stranger, they may travel many miles without starting______conversation.
A．a...the...the
B．an...a...a
C．an...a...the
D．a...a...the
妊娠滋养细胞疾病时，绒毛膜促性腺激素刺激能引起
A．卵泡囊肿B．黄素囊肿C．黄体囊肿D．皮样囊肿E．巧克力囊肿
