氧气顶吹转炉为促进脱硫，渣中（Fe）要求（）。
A.越高越好
B.低些好
C.不影响
D.影响不大
参考答案：B
—How did you find your visit to the exhibition, John?
—______
A．By taking a No. 3 bus.
B．Oh, wonderful, indeed.
C．I went there alone.
D．A classmate of mine showed me the way
正常成年人，24小时尿量为（）。
A.800～900mL
B.1000～2000mL
C.1600～1800mL
D.1900～2000mL
E.2200～2500mL
