产生金属指示剂的僵化现象是因为（）.
A、指示剂不稳定
B.、MIn溶解度小
C、KˊMIn
D、KˊMIn>KˊMY
参考答案：B
The pencil ________ which you wrote just now______ me. [ ]
A. in; belonging to
B. \; is belonging to
C. with; belongs to
D. with; is belonged to
肉瘤的主要转移途径是( )
A．直接蔓延B．血道转移C．淋巴道转移D．种植性转移E．医源性转移
