【单选题】【消耗次数:1】
了防止钢铁锈蚀,下列防护方法中正确的是( )。
在精密机床的铁床上安装铜螺钉
在排放海水的钢铁阀门上用导线连接一块石墨,一同浸入海水中
在海轮舷上用铁丝系住锌板浸在海水里
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