衡量仪表的实际特性偏离其理论上的线性程度的指标是（）。
A.变差
B.回差
C.滞后时间
D.非线性误差
参考答案：B
Few people know the fact ______ was not until 1936 that basketball became a regular part of the Olympic Games.
A．it that
B．that it
C．that
D．it
目前积分兑换的途径有（）：
A.网站
B.短信
C.营业前台
D.12580
