钢轨母材顶面凹陷大于()毫米,应及时修理
A.0.2
B.0.3
C.0.4
D.0.5
参考答案:B
He didn't run ________, so he fell behind.[ ]
A. fast enough
B. enough fast
C. slow enough
D. enough slow
急性化脓性中耳炎鼓膜穿刺后局部治疗有误的是
A.1%酚甘油滴耳剂滴耳B.3%双氧水清洗外耳道C.局部应用抗生素水溶液D.脓液减少,炎症消退时可用甘油或酒精制剂滴耳E.炎症确已消退而穿孔长期不愈者可行鼓膜成形术