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【简答题】
Benjamin Franklin and his inventions Benjamin Franklin was a very talented man. He invented man yuseful things. We still use some of them nowadays. In the 1740s Franklin invented the Pennsylvania Fireplace. It worked like a normal fireplace but it created more heat than a normal fireplace. People liked the Franklin Stove, as it is also called, but they only used it as a heater and not to cook hot food and drinks. Franklin was also very popular for his bifocals — a wonderful type of glasses. He needed glasses to help him see things far away and close to him. One pair of glasses only helped one of these problems, so Franklin needed to carry two pairs of glasses. One day, he got tired of always changing glasses, so he decided to put two lenses into one pair of glasses. The top lens helped him to see far away, and the bottom lens helped him to see things which' were close to him. He c alled this new type of gl a ss bifocals. Frank l in also invented the ligh t ning rod. This was a mental sick put on houses, barns or other b uildings from fire , heavy sto r ms, light ni n g hit this rod and not the building. This invention saved many buildings from fire. Unfortunately, F ranklin got an electric shock when he was doing this experiment. He did not patent any of the items he invented. A patent is a law which m e ans the inventor protects the use of his or her invention.When you patent your invention,other people cannot produce or use your invention without your agreement .Ben thought his ideas should be used to improve the lives of everyone
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举一反三
【判断题】在N个结点的二叉排序中查找一个关键字,进行关键字比较次数的最大值为N
A.
正确
B.
错误
【单选题】如图所示,该电路中有 条支路。
A.
1;
B.
2;
C.
3;
【判断题】T63 逻辑变量取值的 0和1表示事物相互独立而又联系的两个方面。( )
A.
正确
B.
错误
【单选题】1930年1月,毛泽东明确提出“以乡村为中心”思想的重要著作是
A.
《中国的红色政权为什么能够存在?》
B.
《井冈山的斗争》
C.
《星星之火,可以燎原》
D.
《反对本本主义》
【单选题】在含有 n 个结点的二叉排序树中查找一个关键字,最多可能需要进行( )次关键字比较。
A.
B.
C.
n/2
D.
n
【单选题】不属于摩托车传动系功用的是()。
A.
传递动,改变发动机扭矩
B.
变换行使速度
C.
平稳起步、换档和停车
D.
转向轻便、制动灵活
【单选题】输入一组序列3,6,1,2,7,4,通过下面方法正确建立二叉排序树
A.
画一颗二叉树,把输入序列数字填入进去,填的时候注意每颗子树满足二叉排序树的性质:根结点关键字大于所有左子树的结点的关键字;根结点的关键字小于所有右子树的结点的关键字。
B.
先建立空树,然后采用二叉排序树插入新结点的方法,按照输入数据顺序依次插入每一个数据到二叉排序树当中,直到所有数据插入完成,则得到一颗有n个结点的二叉排序树。
C.
找一颗存在的二叉排序树,然后修改里面的数据为3,6,1,2,7,4
D.
先要有一颗包含3,6,1,2,7,4数据的二叉排序树,再进行插入删除,查找等操作
【多选题】盲人定向行走可以依靠什么
A.
盲杖
B.
导盲犬
C.
听觉
D.
第六感
【简答题】如图所示,该电路有 ()支路。
【多选题】中国内地及香港地区, UHF 频段 RFID 的频率为(   )。
A.
840~845MHz
B.
920~925MHz
C.
902~928MHz
D.
868~870MHz
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