"Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）. ["east iron is a cheap material","cast iron can pollute sea water","cast iron has mere corrosive than bronzes to sea water","cast iron is more corrosive to sea water when it meets with bronze"]
由于RGB颜色模式的三原色在合成时可以产生白色，因此，称此颜色模式为（）。 ["加色模式","减色模式","互补色模式","印刷色模式"]
If a towing vessel and her tow are severely restricted in their ability to change course，they may show lights in addition to their towing identification lights. These additional lights may be shown if the tow is（）. ["pushed ahead","towed alongside","towed astern","Any of the above"]
管路安装标准化操作前检查的内容有（） ["检查工具齐全","刹车灵活好用","流程正确","配电箱不带电","不渗不漏"]
卷烟需求预测按预测周期分为哪几种？何时开展？
在检修空分设备进行动火焊接时应注意什么问题？
