胃癌特殊病理类型有()
A．印戒细胞癌
B．腺鳞癌
C．鳞癌
D．类癌
E．未分化癌
参考答案：B, C, D, E
_____, Mother will wait for him to have dinner together. [ ]
A. However late he is
B. However he is late
C. However is he late
D. However late is he
下面关于B737-600空气再循环系统的说法不对的是（）。
A.可让座舱50%的空气进入再循环
B.可实现烟雾模式
C.可减小发动机引气系统负载
D.主要用于货舱防火
