______是储存管理的基本原则之一，有效地保证了物品储存期不致过长。
A．“四号定位”
B．“五五化”
C．“三三制”
D．“先进先出”
参考答案：D
_____ her help, we were able to finish our work ahead of time.
A．Result in
B．Brought in
C．Introduced to
D．Thanks to
火区封闭后，应采取（）措施，减少（）
