电泳槽液循环系统中分体卧式泵液封压力一般为（）kgf/cm2
A、1-3
B、2-4
C、3-5
D、4-6
参考答案：C
She ______ for 15 years, yet she didn’t know what kind of man she ______.
A．had married; married
B．had been married; married to
C．had been married; had married
D．married; had married to
确认的致癌物的判定依据应来自（）
A.临床观察
B.实验研究
C.流行病学调查
D.动物实验
E.体外试验
