下列对诊断腺垂体功能减退症无意义的是（）
A.性腺激素测定
B.甲状腺素测定
C.皮质醇测定
D.甲状旁腺素测定
E.泌乳素测定
参考答案：D
We think white looks good _____ you, but people with black skins don't look good ______ white. [ ]
A. on, on
B. in, in
C. on, in
D. in, on
正态方差σ2的无偏估计是()。
A.A
B.B
C.C
D.D
