容易产生酸败现象的是
A．淀粉B．粘液质C．油脂D．挥发油E．色素
参考答案：C
____________ from other continents for millions of years,Australia has many plants and animals not found in any other country in the world.
A Being separated B Having separated C Having been separated D To be separated
CT图像的金属伪影通常表现为（）
A.鱼骨样
B.杯状
C.尖峰状
D.疤痕状
E.条纹状
