【简答题】A.It is a race for gold and silver. B.It is a race for computer technology. C.It is a contest of strength and speed. D.It is a contest of mind, athletic determination and foreign languages.
【判断题】一个单位长度上密绕有n匝线圈的长直螺线管,每匝线圈中通有强度为I的电流,管内充满相对磁导率为ur的磁介质,则管内中部附近磁感应强度为μrμ0nI,磁场强度为nI.
【多选题】蓄电池的充电种类主要有 、 和 等三种。
【单选题】可锻铸铁主要用于制作要求有一定强度、塑性和韧性的( )。
【简答题】一个单位长度上密绕有n匝线圈的长直螺线管,每匝线圈中通有强度为I的电流,管内充满相对磁导率为mr的磁介质,则管内中部附近磁感强度B =,磁场强度H =.
【单选题】可锻铸铁主要用于制作要求有一定强度、塑性和韧性的( )铸件。
【单选题】What is wrong about Jeremy Goldkorn?
A.
He is the creator of biog.
B.
He is a co-founder of Beijing-based advertising agency Standards.
C.
He is a blogger in Beijing who writes in English.
D.
He usually updates his blog with latest happenings in China.
【单选题】A co is a co based in UK and B is an American co. The A co has to pay 5m dollars to B in 3 months. A co decided to use money market to hedge potential risk. The annual interest rates available to A an...
【单选题】Professor Baker is a co-worker of Professor Ayers.
【单选题】正态分布曲线下,横轴上从 μ-σ 到 μ+1.96σ 的面积为( )