下列哪些人避免使用碘剂()
A.肾功不全
B.肝功不全
C.碘过敏
D.有甲状腺疾病病史
参考答案:A, C, D
I've got _____ uncle, but I haven't got _____ aunt. [ ]
A. a; an
B. an; a
C. a; a
D. an; an
执行下列语句,其函数结果为 STORE-100 TO X SIGN(X) * SQRT(ABS(X))
A.10
B.-10
C.l00
D.-100