Each year in the United States, many black teenagers（）of school, either because they cannot keep up or they have to work to support their family. ["go out","drop out","check out","pull out"]
爆破后发现保留部分结构有危险征兆时，应立即采取（）措施。 ["防护","保全","安全","加固"]
下列哪些属探掘进工作面水文异常的物探仪器（） ["瑞利波探测仪","坑透仪","直流电法仪","高密度电法仪","便携式地质探测仪"]
金融风险具有（）等一般特征。 ["不确定性","传递性","双重性","普遍性","客观性"]
建筑外窗气密性能分为（）级。 ["8","6","5","4"]
刘德华是娱乐圈的天王巨星，出道至今，他所拍摄的电视剧、电影及灌录的唱片风行全世界，成为千万影迷及歌迷的超级偶像，那么你知道华仔出道前的原名是什么吗？
