如果病人出现腹痛加重，伴腹胀，恶心呕吐，应想到以下哪项可能
A．肠穿孔B．肠道出血C．幽门梗阻D．肠梗阻E．局部癌变
参考答案：D
----Is there any difference___the two shirts?
----Yes. The color is different.
A．from
B．for
C．between
D．with
防排烟有哪几种形式？其适用范围如何？
