外汇风险管理机制包括()。
A.确定外汇风险管理目标
B.预测汇率的变动
C.计算因货币价值变动而使企业可能遭受损失的程度
D.制定对外汇风险的防范策略
参考答案:A, B, C, D
Not until I went through his paper _________ what rapid progress he had made in writing.
A.I did find
B.did I find
C.I had found
D.was I found
污泥沉降比(SV30)