1μg的β-胡萝卜素相当于0.167μg的视黄醇当量。( )
参考答案：对
Lots of trees ________in our city over the years. It is becoming greener and greener!
A．are planting
B．have planted
C．will be planted
D．have been planted
良性单克隆丙球蛋白病常出现
A．贫血B．血中Ig升高C．本周蛋白D．骨损害E．游离轻链
