根据《建筑施工安全检查标准JGJ59-99》，（）是起重吊装安全检查保证项目之一。
A.施工方案
B.高处作业
C.起重作业
D.构件堆放
参考答案：A
开车时蒸汽管为什么要排放冷凝水？
Hardly had he finished his speech ______ the audience started cheering.
A. thenB. whenC. thanD. as
