电位滴定法的氧化还原滴定（如卡尔费休法测定水含量）中通常采用（）电极作指示电极。
A.铂
B.银
C.饱和甘汞
D.pH
参考答案：A
It was ________ done _______ Marry jumped up with joy.
A．so beautifully; that
B．such beautiful; that
C．such beautiful; as
D．so beautifully; as
鳞癌可发生在以下哪些病变的皮损上（）。
A.光线性角化病
B.盘状红斑狼疮
C.慢性溃疡
D.寻常狼疮
E.黏膜白斑
