一般位于体型较复杂的建筑物各分段的连接处或建筑物内部某些人流或物流的集中交汇处,起到缓冲的作用是()
A.门厅
B.楼梯和电梯
C.过厅
D.走道
参考答案:B
—I’m very tired these days because of studying for physics.
—Why not ______ music. It can make you _______.
A.listen to; relaxing
B.listen to; to relax
C.listening to; relax
D.listen to; relaxed
下列引起左心室后负荷增加的是()
A.二尖瓣关闭不全
B.肺动脉瓣狭窄
C.二尖瓣狭窄
D.主动脉瓣狭窄
E.动脉导管未闭