請依下文回答第 41 題至第 45 題：Except in very rare cases, for instance whilst the ship is en voyage, it would be, in case of fire, a sound         41   neverto use sea water unless absolutely forced to do so. There are many circumstances in which sea water has a secondaryeffect. In the   42   spaces, for example, there would be an irreversible damage done to the steelwork and copperfitments. Sea water is very slow drying and leaves a residue which has a   43   action. Since metal is microscopicallyporous, it will be understood that mere wiping down will not completely remove the effect. In addition, acids have adefinite   44   to any form of water. The accepted rule is: never add water to acid. The action of water in contact withthe acid is to   45   heat. If sea water is used, there will be a production of even more choking fume.
【題組】 41
(A) echo
(B) axiom
(C) detection
(D) navigation