室上性心动过速伴预激综合征者预防复发可选择( )
A．压迫眼球或刺激咽喉部B．电击复律C．射频消融D．口服地高辛E．奎尼丁
参考答案：E
—Where is your brother now, Alan?
—_____. [ ]
A. He is working in the school
B. He likes singing
C. His favorite animals are dolphins
D. He usually gets up at 7:00
轻型桥台帽采用钢筋混凝土浇筑，其混凝土的标号不低于( )。
A．C10B．C15C．C20D．C25
