ETF的建仓期不能超过6个月。（）
参考答案：错
解析：掌握ETF份额的交易规则。
In 1862 the American black people won their struggle____ equal rights after many years’ fighting ________ the white.
A．against; with
B．for; against
C．with; for
D．for; for
吸附、吸附过程、离子交换。
