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【多选题】
对于恒定磁场,下列说法正确的是:A.
恒定磁场是无源有旋场；
B.
对于两种媒质的分界面，磁感应强度矢量的法向分量连续，即 B 1n =B 2n ；
C.
只有两种媒质的分界面上没有电流分布时，磁场强度矢量 H 的切向分量才连续，即 H 1t =H 2t ；
D.
若两种媒质分界面上存在电流且电流密度为 K ，磁场强度矢量在分界面上将存在突变，且满足 H 1t -H 2t =K;
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【简答题】What item has David Price given each student?
【单选题】Normally a student must attend a certain number of courses in order to graduate, and each course that he attends gives him a credit(学分) which he may count towards a degree. In many American universiti...
A.
36
B.
12
C.
20
D.
15
【单选题】Normally a student must attend a certain number of courses in order to graduate, and each course which he attends gives him a credit which he may count towards a degree. In many American universities ...
A.
36
B.
12
C.
20
D.
15
【单选题】Normally a student must attend a certain number of courses in order to graduate, and each course which he attends gives a credit which may matter toward a degree. In many American universities the tot...
A.
36
B.
20
C.
12
D.
15
【单选题】Storage will be ______ on each piece of luggage remaining at stations over 24 hours.
A.
expended
B.
offered
C.
cost
D.
charged
【判断题】Asian teachers place a lot of importance on the qualities that make each student special. ()
A.
正确
B.
错误
【简答题】Each student is to give a short___ (speak)to the rest of the class at the end of the semester.
【单选题】Normally a student must attend a certain number of courses in order to graduate, and each course which he attends gives him a credit which he may count towards a degree. In many American universities ...
A.
36
B.
12
C.
20
D.
15
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