与膀胱癌关系密切的是
A．3，4-苯并芘B．黄曲霉毒素C．石棉纤维D．紫外线E．乙萘胺
参考答案：E
--- My God! I haven’t prepared the files for the new project yet!
--- _______. The boss won’t need it until next Friday.
A．There’s no doubt
B．There’s no panic
C．Good luck
D．Sounds good
两座高层建筑或当相邻较高一面外墙的开口部位设有耐火极限不低于1.2h的防火门窗其间距不宜小于（）m。
A、3.5
B、4
C、6
D、不限
