【单选题】心抑制中枢的神经元兴奋性升高时,通过( )传出神经冲动,使心跳减慢。
【单选题】心抑制中枢的神经元兴奋性升高时,通过( )传出神经冲动,使心跳减慢。
【单选题】I think it is a waste of time to have remarks not ______ to the subject under discussion
【单选题】我国新型农村合作医疗的筹资机制是( )。
【单选题】心加速中枢的神经元兴奋性升高时,通过( )把神经冲动传达至心脏,使心跳加快、增强。
【单选题】The Federation of American Scientists believes that
A.
it is a waste of time to play video games.
B.
some video games are beneficial to children.
C.
such games as Half-Life 2 is unforgettable.
D.
the function of some video games is exaggerating.
【单选题】Most teachers think it is a waste of time to play online.
【单选题】阿托品用于治疗不完全性肠梗阻患者时,其主要作用是
【单选题】20纪20年代,坑农在研究中发现,个体在觉察到威胁时,中枢神经系统兴奋性升高,机体变得警觉、敏感,机体被迅速地唤醒,通过交感神经和内分泌系统的作用,心率加快、心肌收缩力增强、血压升高,呼吸加快。这种反应称之为_________