三大战役奠定了人民解放战争在全国胜利的基础。下列四幅图中哪一幅是《三大战役示意图》[ ]
A
B
C
D
答案：D
A wonderful idea suddenly occurred to me _______ I would turn to the reference book to finish my homework
A．that
B．if
C．when
D．which
根据《建筑施工碗扣式钢管脚手架安全技术规范》，双排脚手架的搭设应与建筑物施工同步上升，并应高于作业面（）
A.1m
B.1.5m
C.2m
D.3m
