对溃疡性结肠炎最有价值的诊断方法是
A．临床表现B．便常规C．X线钡剂灌肠D．血清α2球蛋白测定E．结肠镜检查
参考答案：E
—Do you know Joe Sutter, the ______ of the giant plane?
—Yes, he is known ______ the "Father of the 747". [ ]
A. design; as
B. designer; for
C. designer; as
D. design; for
转炉事故停电时的应急措施？
