人体皮肤中与调节体温有关的结构是 [ ]
A．汗腺和表皮
B．毛发和皮脂腺
C．毛发和表皮
D．汗腺和真皮内血管
答案：D
_____ the three elements of productive forces, namely, the people, the means of production and the subject of labor, the people is that most critical.
A．From
B．With
C．For
D．Of
语句select initcap（‘aBcDefg’）fromdual；的结果是（）。
A.abcd efg
B.AbCd EfG
C.ABCD EFG
D.Abcd Efg
