老年性骨质疏松宜选用
A．黄体酮
B．丙酸睾酮
C．甲睾酮
D．苯丙酸诺龙
E．炔诺酮
参考答案：D
润滑油的作用包含（）
A.润滑作用
B.冷却作用
C.洗涤作用
D.防锈作用
E.密封作用
F.缓冲和减震作用
More and more vehicles using cheap fuel, declared scientists at the conference, have left Bangkok’s children with body lead levels the world highest.
A．in the world highest B．in the world’s highestC．among the world’s highest D．among the highest of world
