能够用于激光光动力疗法的药物是()。
A.吲哚青绿
B.荧光素钠
C.丙酮
D.血卟啉衍生物
E.甲醇
参考答案:D
His report was so exciting that it was __ interrupted by applause(掌声).
A.constantly
B.constant
C.seldom
D.never
凝结水含氧量升高的原因有()。
A.真空系统漏空气
B.凝结水泵入口管路漏空气
C.凝结水泵盘根密封水中断或过少,引起盘根漏空气
D.负荷过高