问题
单项选择题
使严重放射性胃肠损伤的发生率明显升高的最低放射剂量是（）
A.20Gy
B.30Gy
C.40Gy
D.50Gy
E.60Gy
答案
参考答案：D
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使严重放射性胃肠损伤的发生率明显升高的最低放射剂量是（）
A.20Gy
B.30Gy
C.40Gy
D.50Gy
E.60Gy
参考答案：D
| 用方框内所给词组的适当形式填空。 | |
2. There are _____ two hundred people at the meeting. 3. ____ , what are you going to do in ten minutes? 4. We can't buy that doll because we've _____ money. 5. My English teacher is _____ my aunt. |