电生理检查，部分神经损伤时可见（）
A.正锐波
B.纤颤电位
C.平均时限延长
D.记录不到电位
E.波幅及电压正常
参考答案：C
So far this year we _____ a fall in house prices by between 5 percent and 10 percent. [ ]
A. saw
B. see
C. had seen
D. have seen
何为变质作用，变质作用有那些主要类型？
