楼地层包括( )。
A．楼板层和地坪层
B．上楼层和下楼层
C．地下层和地上层
D．垫层和附加层
参考答案：A
循环水在循环过程中不断有水量的损失，因此在流程中要加设（）保证循环量。
A.过滤器
B.补水线
C.加药罐
D.补水阀
Different type of capital markets have different functions. Which of the following describes the most direct function of: primary capital markets secondary capital markets（）
A. Source of liquidity Security underwriting
B. Source of new capital Source of liquidity
C. Source of new capital Security underwriting
