气水热液按其来源可分为哪些种类？
参考答案：
1）岩浆成因热液
2）变质成因热液
3）地下水热液
4）大气水热液
5）幔源初生水热液
代销渠道与生产者是商品买卖关系。
If investors’ expected future incomes increase, all else constant, interest rates will:（）
A. fall, while an increase in the demand for financial capital will cause rates to rise.
B. rise, while an increase in the demand for financial capital will cause rates to fall.
C. rise, while an increase in the demand for financial capital will also cause rates to rise.
