Which display indicates a vessel conducting mineclearance operations（）. ["Three balls in a vertical line","Two balls in a vertical line","One ball near the foremast and one ball at each yardarm","One diamond near the foremast and one ball at each yardarm"]
产品的竞争力主要体现在（）。 ["品牌","性能","技术","质量","价格"]
The alarm signal for engine room catching fire is a blast of random bell follow by （） ["two knock","three knocks","four knocks","five knock"]
2013年深秋，我国某城市钢厂内某道路两侧的法国梧桐现春秋两景，道路一侧的春意盎然，一侧的树叶金黄。专家解释形成奇景的主要原因是温度。下图为钢厂局部示意图。
法国梧桐树叶最早变黄的城市是（） ["武汉","郑州","北京","哈尔滨"]
WMZ-41型保护中主机和从机的功能有哪些？
母联失灵保护（死区保护）的原理及作用是什么？
