下列属于危险易燃固体的是什么?
A.火柴
B.火药
C.电石
D.炸药
参考答案:A
The police found that the house _______ and a lot of things _______.
A.has broken into; has been stolen
B.had broken into; had been stolen
C.has been broken; stolen
D.had been broken into; stolen
取水许可和水资源费征收管理制度的实施应当遵循什么样的原则?