The primary hazard of liquefied petroleum gas and liquefied natural gas is（）. ["pressure","toxicity","temperature","flammability"]
开心农场是多少个人开发的（）。 ["一个人","三个人","10个人","一个团队"]
When the general alarm is sounded continuously, the engine room personnel should （）. ["proceed to their man overboard stations","start the fire pump","put on lifejackets and go to their abandon ship stations","secure the propulsion diesel engines and evacuate the engine room"]
Word2003编辑表格时，关于编辑列宽和行高正确的说法是（）。 ["可以通过[表格]下拉菜单增加新行或新列","不可以人为的增加新行或新列","对于表格的列宽或行高可以选中并拖动来进行调整","以上的说法都不正确"]
为什么不能用高压摇表测量低压设备的绝缘电阻（） ["因为低压设备内部绝缘材料很厚，有可能使高压摇表损坏，所以不能用","因为高压摇表的电流小，所以小电流对低压绝缘材料不起作用，所以不能用","因为低压设备内部绝缘材料所能承受的电压不高，很可能被击穿","因为高压摇表的高压压力太大，对电动机的绝缘冲击破坏太大所以不能用"]
南极大陆有哪些重要矿产？其分布情况如何？
