皮皮学，免费搜题
登录
搜题
【单选题】
关于定理的理解有下面几种说法,其正确的是A.
如果面上 处处为零，则该面内必无电荷
B.
如果面内无，则面上 处处为零
C.
如果面上 处处不为零，则面内必有电荷。
D.
如果面内有净电荷，则通过面的电场强度通量必不为零
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】( ) you study harder, you’ll never pass the final exam.
A.
Unless
B.
If
C.
Until
D.
Except
【单选题】If you study harder, you will catch______the others in the class.
A.
up
B.
up with
C.
up of
D.
to
【简答题】线切割机诮按电极丝运动的线速度来分类,其中,电极丝运动速度在( )m/s为高速走丝,低于( )m/s为低速走丝。
【简答题】“I sometimes get up at three or four in the morning and I surf the net．” “I often check my e-mail forty times a day．” “1 often spend more than three hours during one time on the net．’’ “I spend more t...
【简答题】“I sometimes get up at three or four in the morning and I surf the net.” “I often check my e-mail forty times a day. ” “I often spend more than three hours during one time on the net.” “I spend more t...
【单选题】If you study harder , you will ___________go to college . [ ]
A.
can
B.
are able to
C.
be able to
D.
be able
【单选题】( ) you study harder, you'll never pass the final exam.
A.
If
B.
Until
C.
Unless
D.
Except
【单选题】_______ you study harder, you'll never pass the final exam. [ ]
A.
If
B.
As
C.
Unless
D.
Until
相关题目：