对进入色谱仪的载气进行稳压、稳流控制和指示流量的是（）部件。
A、气路控制指示
B、取样装置
C、样品处理单元
D、电路控制
参考答案：A
The arbitrage-free bond valuation approach can best be described as the:（）
A. use of a single discount factor.
B. use of a series of spot interest rates that reflect the current term structure.
C. arithmetic average of the spot interest rates.
胶印机各机构的作用胶
