测量值与算术平均值之差的这种测量误差,可以称为(),用Vi表示
A、绝对误差
B、残余误差
C、剩余误差
D、仪表变差
参考答案:B, C
I _____ this book for two weeks. I have to return it now. [ ]
A. borrowed
B. have borrowed
C. kept
D. have kept
痄腮辨证中,以哪些辨证方法为主()
A.经络
B.表里
C.寒热
D.阴阳
E.常证变证