渗出性心包炎
A．心包摩擦音B．舒张早期奔马律C．颈静脉怒张，奇脉，脉压减小D．心界向两侧扩大，心音遥远，Ewart征
参考答案：D
There is little chance that we will manage to change the law. , it is important that we try.
A．Therefore
B．Nevertheless
C．Otherwise
D．Besides
两个或多个群落之间的过渡区域称为__________。
