通过圆心，并且两端都在圆上的线段叫做______，用字母______表示．
通过圆心并且两端都在圆上的线段叫做直径，用字母d表示．
故答案为：直径，d．
关于女性甾体激素，正确的是（）
A.因基本化学结构与胆固醇相同，又名胆固醇激素
B.月经周期后期测血中黄体酮值能证明是否排卵
C.卵巢主要合成及分泌雌酮和雌三醇
D.卵巢可分泌雄酮
E.孕激素含18个碳原子，雌激素含21个碳原子
A client in a psychiatric clinic unit tells the nurse, "I don't think I can face going home tomorrow. " The nurse replies, "Do you want to talk more about it" The nurse is using which of the following techniques
A．Presenting reality.
B．Making observations.
C．Restating.
D．Exploring.
