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【单选题】
关于点电荷的电场有下列说法,其中正确的是 ·A.
利用点电荷的场强公式与迭加原理,可求各种带电体的场强。 ·
B.
公式 中的Q也是试验电荷。 ·
C.
对正点电荷由 知r越小电场越强;对负点电荷由 知r越小电场越弱( 为单位矢径) ·
D.
由 知,当 时, 。
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【单选题】We shall call on her as soon _____.
A.
as she will come
B.
as she came
C.
as she comes
D.
she comes
【单选题】We shall call on her as soon ___________.
A.
as she will come
B.
as she shall come
C.
as she comes
D.
she comes
【单选题】— When shall we go to visit her? — Take your time. I'll ____ you at your office then. [ ]
A.
call
B.
call on
C.
call at
D.
call for
【单选题】We shall call on her as soon ______.
A.
as she comes
B.
she comes
C.
as she shall come
D.
as she will come
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