电缆终端头固定后的接线端子及其引线，各相对地及相间带电体间距离应满足要求，电缆头三叉口以上至接线端子各相距离不宜小于（）mm。 ["100","50","200","300"]
Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?（） ["Hydrochloric acid","Chlorine","Sulfuric acid","Zinc chromate"]
（）the demand of the shipper the Shipowner must issue a bill of lading giving certain particulars，e.g. quality of goods shipped，their apparent condition. ["In","At","By","O"]
《八十天环游地球》中作为英国的殖民地，（）是费克斯拘捕福克的最后一次机会了。 ["印度孟买","日本横滨","香港"]
萎瘪病的症状是什么？
安全水封用于什么系统中，由几个罐和几根管组成？
