应急程序中，（）是应急指挥、协调和与外界联系的重要保障。
A.指挥与控制
B.警报和紧急公告
C.通信
D.事态监测与评估
参考答案：C
--- I once got lost during my first visit to Beijing.
-- Oh, did you? You _______ me as your guide.
A．might have asked
B．could ask
C．would have asked
D．would ask
动脉血压脉压大小主要反映
A．每搏输出量的多少B．外周阻力的大小C．大动脉弹性的好坏D．心脏泵血功能的好坏E．血管充盈的程度
