因各肿瘤发病的年龄分布不同，食管癌的峰型呈

A．单峰型

B．缓慢上升型

C．持续升高型

D．双峰型

E．侧峰型

Which of following data is NOT painted on the bow of a lifeboat?（）.

A.Number of persons allowed

B.Name of the vessel

C.Weight of the boat

D.Home port