第1题: [单项选择]人工心脏起搏器的作用原理是() A. 通过向心脏放以高压强电流使心肌瞬间同时除极化 B. 通过向心脏放以高压强电流使心肌瞬间同时复极化 C. 通过发放脉冲电流刺激窦房结形成人工兴奋灶 D. 通过发放脉冲电流刺激心肌形成人工异位兴奋灶 E. 以上都不是 参考答案:D 答案解析:能替代或补充正常激发和控制心脏收缩的生理电子系统。它通过周期性发放的电脉冲刺激心脏,引起心搏,并实现生物功能控制。
第16题: [单项选择]Just as too much harmony is tiresome in music ______. A. the life of too many benefits annoys us B. so, in life, too many benefits annoy us C. we are annoyed with lives also of too many benefits D. much benefits annoy us in life 参考答案:B