Please ______ your money in a safe (安全的) place. [ ]
A. take
B. trade
C. keep
D. bring
答案:C
若线段a,b,c组成直角三角形,则它们的比应为( )
A.2:3:4
B.3:4:6
C.3:4:5
D.4:6:7
天疱疮的皮损特征是:
A.皮肤群集水疱
B.皮肤张力性水疱,尼氏征阴性
C.脐型水疱
D.血性水疱
E.皮肤松弛性水疱,尼氏征阳性