会骑自行车有助于学骑摩托车，这是（）。
A.系列位置效应
B.正迁移
C.负迁移
D.技能学习
参考答案：B
As per UCP 600, the words “to”, “till”, “from”, “between” when used to determine a period of shipment include the date or dates mentioned, the words “before” and “after” exclude the date mentioned. （）
除萌
