某一溶液透光度为46.2%，相应的吸光度是（）。
A.0.345
B.0.445
C.0.545
D.0.335
参考答案：D
My mother is a kind woman, _____________?[ ]
A. is she
B. is he
C. isn't she
D. isn't he
检查胃有无幽门螺杆菌的试验是( )
A．胃酸分析B．乳酸测定C．隐血试验D．胆汁测定E．尿素试验
