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【多选题】
关于电感中磁场能量的说法正确的是( )。A.
任意时刻电感中磁场能量,等于该时刻电流的平方与电感乘积的一半
B.
磁场能量可能为正
C.
可能为负
D.
磁场能量可能为零
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【简答题】铁路标准轨距是 m。
【简答题】铁路标准轨距是 m。A. 1.435
【简答题】铁路标准轨距是 ( )m m。
【简答题】9. Joyce played a
of tennis. After that, she swam for half an hour. A. Run-on B. OK
【单选题】Joyce Sipes and Mary Ellen Dodge When Joyce Sipes was diagnosed with breast cancer in 1999,she shared the news immediately with her sister Mary Ellen Dodge.Mary Ellen was there for her-helping her thr...
A.
She recommended Dr.Walket.
B.
She kept her from being disturbed.
C.
She asked her a lot of questions.
D.
She comforted her as much as she could.
【单选题】Dr. Griffiths' s research helps you find out______.
A.
which group of gamblers played the game better
B.
a chemical to increase gamblers' heart beat
C.
a way to help gamblers give up gambling
D.
when gamblers should be given drugs
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