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【简答题】
考虑用分支限界解0-1背包问题 给定n种物品和一背包。物品i的重量是wi,其价值为vi,背包的容量为C。问选择装入背包的物品,使得装入背包中物品的总价值最大? 示例:n=3,C=30,w={16,15,15},v={45,25,25} 求: 1、问题的解空间树 2、约束条件 2、如何剪枝?
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参考答案:
举一反三
【单选题】某女,28岁,孕3产0,妊娠34周。第一胎人工流产,第二胎为脊柱裂畸形,于妊娠24周时引产。此次妊娠早期无异常情况。妊娠32周时B超检查提示:羊水偏多,胎儿大于妊娠月份,未见明显畸形。孕妇体型肥胖,有多饮、多尿、多食史。为明确诊断,首选采取下列哪一项检查()
A.
测定尿蛋白
B.
肝肾功能
C.
OGTT试验
D.
脂蛋白测定
E.
血清HpL测定
【单选题】The teacher asks a student a question "Have you ever bought clothes with problems?" If the student doesn't seem to be ready, the teacher says "for example, a shirt without..." and points to the button...
A.
controller
B.
assessor
C.
organiser
D.
prompter
E.
participant
F.
resource-provider
【单选题】使橡胶分子产生交联,获得弹性的工艺过程称为()。
A.
硫化
B.
塑炼
C.
混炼
D.
压延
【判断题】液压马达的转速n=Q/V,因此其转速可以无限调高。
A.
正确
B.
错误
【判断题】普通螺纹的特征代号为Tr。
A.
正确
B.
错误
【简答题】Read the following cartoon. Put a tick by the three statements that are most logically based on the information suggested by the cartoon.A. ___A. Lucy has just criticized the boy, Linus. B. ___B. Linu...
【简答题】Complete the following sentences with the words and phrases given below. requisite / comprise / chill out / come to mind / look the part A. He doesn't act his age or , but his birth certificate is tel...
【多选题】选词填空: pastime | straightforward | souvenir | unintentionally | gems Most road signs you come across are____1____. [填空1] They tell you what to do, which direction to go in, where you are, etc., but occ...
A.
straightforward
B.
unintentionally
C.
pastime
D.
gems
E.
souvenir
【单选题】关于电热水器的防护方法,下列措施合理的是( )
A.
插入碳棒
B.
在内胆外涂点油漆
C.
插入镁棒
D.
插入铁棒
【单选题】使橡胶分子产生交联,获得弹性的工艺过程称为
A.
硫化
B.
塑炼
C.
混炼
D.
成型
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