开胸后静脉回心血量减少对循环可造成哪些影响()
A.心跳骤停
B.血压下降
C.心动过速
D.心律失常
E.心排血量减低
参考答案:A, B, C, D, E
With a lot of difficult problems________,the newlyelected president is having a hard time.[ ]
A.settled
B.settling
C.to settle
D.being settled
复理石