问题
单项选择题
对于感觉神经，可产生镇痛和镇静中枢的频率是（）
A.100Hz左右
B.50Hz
C.20～30Hz
D.200Hz
E.1～10Hz
答案
参考答案：A
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对于感觉神经，可产生镇痛和镇静中枢的频率是（）
A.100Hz左右
B.50Hz
C.20～30Hz
D.200Hz
E.1～10Hz
参考答案：A
| 从方框中选择合适的单词将短文补充完整。 | |
bought presents for friends. But on Wednesday, Mike got 3 . He went to a policeman and 4 help. The policeman 5 him to take the No. 16 bus. Then 6 at the hotel. He arrived safely. |