A. half the engine rotational speed B. twice the engine rotational speed C. the engine rotational speed D. four times the engine rotational speed
A. 正确 B. 错误
A. 与雌激素作用活跃有密切关系 B. 好发于18~25岁 C. 乳房胀痛具有周期性特点 D. 月经周期对肿块的大小无影响 E. 好发于乳房外上象限,多数单发