下列能使心输出量增加的因素是()
A.心迷走中枢紧张性增高
B.心交感中枢紧张性增高
C.静脉回心血量减少
D.心室舒张末期容积减小
E.颈动脉窦内压力增高
参考答案:B
Upon graduation he asked to be sent to _______________.
A.where he is most needed
B.where he needed
C.where he is mostly needed
D.where is he mostly needed
资本—帝国主义的入侵给中国带来了什么?