先天性肥厚性幽门狭窄典型的症状和体征为______、______和______。
参考答案：无胆汁的喷射性呕吐；胃蠕动波；右上腹肿块
不正确描述腹膜后脂肪肉瘤的是
A．脂肪肉瘤多呈低回声
B．瘤体多较大而呈分叶状
C．多数脂肪肉瘤起源于非脂肪组织
D．病变可侵及到对侧
E．瘤内可有出血囊变的无回声
A．(A) People using the Internet will soon be almost doubled.
B．(B) Population is exploding because of the Internet.
C．(C) Ten years ago, only rich people can afford to use the Internet.
D．(D) The Internet population will increase two fold in ten years.
