问题描述：
[单选]
You must take good care of the drainage cock of the air control systemBecause（）leads scale formed which might malfunction the pilot control valve and other instruments．
A．the temperature
B．the rust
C．the pressure
D．the humidity
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：With（）， the corrosion problems are much reduced in a central cooling system．
下一篇：You increased the（）to 150 tons that’s why the fuel oil（）．
- 我要回答: 网友(3.15.1.23)
- 热门题目: 1.航行中，柴油机曲轴发生断裂事 2.曲轴锻钢件依规范要求应进行（ 3.滑油中含有过多的水分和酸时会