A型胡敏酸 A type humic acid
参考答案：
土壤胡敏酸经险去在pH４醋酸钠缓冲液不溶解的腐解物质后，在其溶液中加硫酸镁而沉淀出的组分。
According to the Global Investment Performance Standards (), which of the following statements is most accurat.e about composites used for performance presentation of a investment management firm（）
A. Composites must include one or more portfolios managed to a similar investment strategy, objective or mandate.
B. Composites must include all discretionary and non-discretionary portfolios managed to a similar investment strategy, objective or mandate.
C. Composites must include all fee-paying and non-fee paying portfolios managed to a similar investment strategy, objective or mandate.
以下对持卡人提现的说法错误的是（）
A、持卡人一次性提现5万以上，需要出示有效身份证件
B、持卡人一次性提现10万以上，必须出示有效身份证件
C、持卡人一次性提现20万以上，需要提前预约
D、持卡人一次性提现50万以上，才需要提前预约
), which of the following statements is most accurat.e about composites used for performance presentation of a investment management firm（）