滑压运行的除氧器变工况时，除氧器（）变化滞后于（）变化。
参考答案：水温、压力
If you go by train，you can have quite ______ comfortable journey, but make sure you take ______fast one.
A．a；aB．the；aC．the：theD．不填；a
简述地质特征。
