鉴别血尿与血红蛋白尿的主要手段是（）。
A.尿隐血检查
B.尿三杯试验
C.尿胆原
D.血尿颜色
E.尿沉渣检查
参考答案：E
In view of the worsening environment, the local government is seeking advice from Professor Smith, who is an expert ______ it.
A．within
B．for
C．on
D．beyond
55×66÷（11×11）=______．
