配电室及箱式变电站出线的室外应做滴水弯，滴水弯最低点距离地面不应小于（）m。
A.1
B.1.5
C.2
D.2.5
参考答案：D
Li Lei didn't come to school today. What _______ to him? [ ]
A. was happened
B. happened
C. is happened
D. happening
关于过敏性紫癜的治疗错误的是（）
A.应用抗组胺药物作为一般治疗
B.腹痛可用阿托品
C.首选免疫抑制剂
D.肾型患者可用抗凝疗法
E.维生素C可降低毛细血管通透性
