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【多选题】
如图11所示,箭头表示电力线方向,穿过一立方形盒子。电场与盒子的左右两面垂直。以下描述哪个是正确的?( )A.
通过盒子左、右两面的电通量不为零，但是通过整个盒子的电通量为零
B.
通过盒子左面的电通量为负、通过右面的电通量为正，都不为零
C.
通过整个盒子的电通量为正
D.
通过盒子左面的电通量为正、通过右面的电通量为负
E.
通过盒子左面的电通量的绝对值小于通过右面的电通量的绝对值
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举一反三
【单选题】正常尿液比重波动范围是
A.
1．10～1．015
B.
1．015～1．025
C.
1．005～1．020
D.
1．015～1．035
E.
1．025～1．o45
【单选题】In short, there is little about today's celebrity culture that is fundamentally more harmful than the types of celebrity children have encountered in the past. Provided children are given appropriate ...
A.
restate their opinion
B.
summarize the main points
C.
make a recommendation
D.
make a prediction (often stating what may happen if the recommended action is or is not taken)
【简答题】While accepting that this sequence fits the archaeological profile of those sites, which were occupied continuously over many thousands of years a number of writers have warned that the underlying ass...
【简答题】夜盲症是因为缺少哪种维生素所导致？
【单选题】There once lived a poor tailor who had a son called Aladdin, a careless, idle boy【21】would do nothing but play all day long in the streets with little idle boys like himself. This so grieved the fathe...
A.
he
B.
who
C.
which
D.
what
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