多糖
参考答案:
由十个以上单糖通过苷键连接而成的糖称为多聚糖或多糖。
Juliana worked harder to ______ for the time she had lost when she was ill.
A.keep up
B.catch up
C.make up
D.take up
减小偶然误差的方法是( )。
A.做空白试验B.做对照试验C.做回收试验D.增加平行测定次数E.选用多种测定方法