最易发生幽门梗阻症状的溃疡是()
A.胃角溃疡
B.胃窦溃疡
C.十二指肠球部溃疡
D.幽门管溃疡
E.球后溃疡
参考答案:D
--- What will the weather be like tomorrow?
--- It ______ be rainy, cloudy or sunny. Who knows?
A.must
B.might
C.shall
D.should
“删除背景”工具是PowerPoint 2010中新增的图片编辑功能。