钢柱整正使用的垫片,每块的面积不小于()。
参考答案:50mm×100mm
___ April Fool's Day, most of his classmates were by him. [ ]
A. On; fooled
B. On; fools
C. At; fooled
D. In; fooled
男性,52岁,上腹不适5年。胃镜检查:胃窦黏膜可透见血管网,胃酸分泌正常()。
A.慢性浅表性胃炎
B.A型胃炎
C.B型胃炎
D.胃癌
E.十二指肠溃疡