发生急性猪瘟时，脾脏的病变特征是（）
A.急性脾炎
B.慢性脾炎
C.化脓性脾炎
D.坏死性脾炎
E.出血性梗死
参考答案：D
The Louvre in Paris is one of the most famous museums, housing many priceless _______.
A．memories
B．catalogues
C．treasures
D．identities
强化燃料油燃烧的途径有哪些？
