仅限于研究中使用的针电极是()
A.多极电极
B.单极针电极
C.同心针电极
D.单纤维针电极
E.软金属导线(50μm)电极
参考答案:A
With all the books she needed _____, she left the library with satisfaction.
A.having borrowed
B.borrowed
C.borrowing
D.to be borrowed
如图,在△ABC中,∠C=90°,AD平分∠BAC,BC=10cm,BD=6cm,则点D到AB的距离为( )cm。