砂的颗粒级配和粗细程度的工程意义是什么？
用矩形的面积来表示某个连续型变量的频数分布，适用于（） ["直方图","普通线图","条图","半数对线图"]
一些发达国家将部分家电生产企业迁往发展中国家，其根本原因是（） ["利用发展中国家的原料","开发发展中国家的市场","该行业污染较为严重转嫁污染","降低生产成本获取最大利润"]
（）A room on or near the bridge provided with the necessary fittings and furniture for the handling and stowage of charts and where the chronometers are placed. ["Captains cabin","Chief officer;s locker","Chartroom","Pilots cabi"]
英朗XT全系采用的后悬挂是（）。 ["复合扭力梁","多连杆","复合扭力梁+瓦特连杆","拖曳臂式"]
目前混凝土的组成材料有哪些？
