经皮冠状动脉腔内成形术所使用的设备包括()
A.手推注射器
B.抢救设备及药物
C.X线
D.球囊加压泵
E.心电监测仪
参考答案:A, B, C, D, E
In our class, when the bell rang and the teacher closed his book, it was a ____ for everyone to
stand up. [ ]
A. signal
B. chance
C. mark
D. measure
隧道防水混凝土的抗渗等级不得小于( )。
A.S2B.S4C.S6D.S8