氧气顶吹转炉炼钢有哪些优点？
参考答案：生产速度快，劳动效率高；品种多、质量好；转炉可以冶炼平炉冶炼的全部钢种；基建投资和生产费用较低。
Peter had intended to take a job in business, but ________ that plan after the unpleasant experience in
Canada in 2010.[ ]
A. had abandoned
B. abandoned
C. abandon
D. will abandon
尿毒症患者肌酐清除率在10ml/min以下时，最理想的治疗方法是
A．纠正贫血
B．纠正酸中毒
C．利尿
D．透析
E．肾移植
