题型:选择题 Nowadays many housewives prefer to go to supermarkets for their shopping, because they provide a large _____ of goods. [ ]A. variation B. various C. varied D. variety 查看答案
题型:单项选择题 A1/A2型题 骨折的愈合过程分为()A.炎症期、修复期、塑型期B.出血期、修复期、愈合期C.血肿机化期、骨痂形成期、改造塑型期D.炎症期、修复期、愈合期E.连接期、成熟期、塑型期 查看答案
题型:解答题 某工厂要制造A种电子装置45台,B种电子装置55台,需用薄钢板给每台装置配一个外壳,已知薄钢板的面积有两种规格:甲种薄钢板每张面积2㎡,可做A、B的外壳分别为3个和5个,乙种薄钢板每张面积3㎡,可做A、B的外壳分别为5个和6个,求两种薄钢板各用多少张,才能使总的用料面积最小? 查看答案