依前列醇可
A.扩张血管,增加毛细血管壁通透性B.收缩血管,增强心肌收缩力C.收缩血管,抑制心肌收缩力D.扩张血管,抑制血小板聚集E.收缩血管,促进血小板聚集
参考答案:D
当道口发生故障时,道口之间使用对讲机相互求助的标准用语是什么?
It is becoming more and more difficult to ____ the problems of traffic in some big cities of our country.[ ]
A. deal with
B. set up
C. put away
D. break down