中心静脉压正常、血压降低时，应选择（）
A．适当补液
B．充分补液
C．扩张血管
D．强心、利尿
E．补液试验
参考答案：E
It was amazing that the army _______ its homeland against all enemies.
A．defended
B．defeated
C．preserved
D．prevented
叠瓦状断层
