心动周期中哪个时相的左心室内压力最高
A．快速充盈期B．心室收缩期末C．等容收缩期末D．快速射血期
参考答案：D
We should consider the students' request _____ the school library provide more books on popular science. [ ]
A. that
B. when
C. which
D. where
下列不属于非特异性感染的是（）.
A.蜂窝组织炎
B.气性坏疽
C.脓肿
D.急性阑尾炎
