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【单选题】
下列关于钢材在使用中防止锈蚀说法有误的一项是()A.
埋于混凝土中的钢筋，处于碱性介质的条件而使钢筋表面形成氧化保护膜，故不致锈蚀
B.
钢结构防止锈蚀的方法通常是采用表面刷漆
C.
钢材采用热浸镀锌或镀锌后加涂塑料涂层，防止锈蚀的效果最好，但价格较高
D.
重要的预应力承重结构，可以掺用氯盐，并对原材料进行严格检验控制
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【简答题】请根据以下内容回答 90～91 题： 第 90 题 于强壮保健的要穴是（ ）
【单选题】The fresh air intake of the inert gas system（）.
A.
prevents the flue gas from falling below 3% content of oxygen
B.
allows the inert gas piping to be used for gas freeing the tanks
C.
opens when there is excessive vacuum on the deck water seal
D.
enables outside air to mix with and cool hot flue gasses
【单选题】The purpose of the deck seal in an inert gas system is to prevent（）.
A.
flammable vapors from entering machinery space
B.
flue gas escaping to atmosphere
C.
inert gas escaping to atmosphere
D.
air entering inert gas system
【单选题】SOLAS regulations require that the inert gas system shall be capable of delivering inert gas with an oxygen content of not more than what percentage?
A.
5%
B.
8%
C.
6%
D.
3%
【单选题】The deck water seal of the inert gas system ______．
A.
Cools the inert gas and prevents soot from entering the cargo tanks
B.
Acts as an emergency shutdown when inlet pressures exceed the safe working pressure
C.
Prevents the backflow of hydrocarbon gasses into nonhazardous areas
D.
Relieves sudden large overpressures in the system
【单选题】The deck water seal of the inert gas system（）.
A.
cools the inert gas and prevents soot from entering the cargo tanks
B.
acts as an emergency system shutdown when the inlet pressures exceed the safe working pressure in the hazardous zone
C.
prevents the backflow of hydrocarbon gasses into nonhazardous areas
D.
relieves sudden large overpressures in the system
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