过敏性紫癜常见的首发症状是()
A.发热
B.皮肤紫癜
C.关节肿痛
D.肾脏损害
E.心脏损害
参考答案:B
入射光波长(),折射角(),折射率()。
A.长,大,变小
B.长,小,变大
C.短,大,变小
D.短,小,变大
The driver hurt the girl _____ badly _____ she had to see a doctor.[ ]
A. so, that
B. either, or
C. too, to
D. neither, nor