写出一个二次项系数为1,且有一个根为2的一元二次方程( )。
(答案不唯一)
—I'm sorry I _ _ _ my homework at home.
—That's all right. Don't forget it to school tomorrow. [ ]
A. forget, to take
B. forget, to bring
C. left, to take
D. left, to bring
食管上段闭锁,下段有瘘与气管相通()
A.Ⅰ型食管闭锁
B.Ⅱ型食管闭锁
C.Ⅲ型食管闭锁
D.Ⅳ型食管闭锁
E.Ⅴ型食管闭锁