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问题 多项选择题

符合幕上良性Ⅰ、Ⅱ级星形细胞瘤影像学征象的是（）。

A.约1/4的病例有钙化

B.大多数表现为脑内混合密度病灶

C.肿瘤边界大多数清楚

D.增强扫描Ⅰ级星形细胞的肿瘤多无明显变化

E.发生于脑皮质多见

答案

参考答案：A, D

填空题

根据句意及汉语提示, 用单词的正确形式填空。

1. His new CD became a _____ (成功且轰动一时的事物) and over ten

thousand copies were sold on the first day.

2. He began to write his first _____ (诗) at the age of eight.

3. Sam, please cook lunch today. It is your _____ (依次轮到的一次机会).

4. This bridge is made of _____ (木头).

5. Mr Green had been _____ (坚决地) against the idea.

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问答题 简答题

确定油气藏形成时间的常用方法有哪些？
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