下列哪种疾病可引起呕吐物多且有粪臭味（）
A.胃潴留
B.肠梗阻
C.急性中毒
D.幽门梗阻
E.十二指肠淤滞
参考答案：B
He______the leader of the Model Group in our factory.
A．has just been appointed B．has just appointed C．just appointed D．has just being appointed
汽轮机保温技术条件中要求汽轮机下缸的保温层厚度可比上缸的厚（）左右。
A.5%
B.10%
C.15%
D.20%
