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【判断题】
调车信号机显示一个蓝色灯光表示准许越过该信号机A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】如图所示，均匀磁场B中放置一通有电流I、半径为R的半圆形导线，导线两端连线与磁感强度方向的夹角为30°，该段半圆弧导线受到的磁力等于 。 【图片】
【单选题】如图所示，一弯成半径为R的半圆形导线，通有电流I，放置在均匀磁场中。则该导线所受磁力的方向为【图片】
A.
垂直纸面向里。
B.
垂直纸面向外。
C.
与磁场同方向。
D.
与磁场反方向。
【单选题】My father gave his old car to me and he is _____ a new car. [ ]
A.
considered buying
B.
considered to buy
C.
considering buying
D.
considering to buy
【简答题】My father told me that he was considered too difficult a student (teach) ______when he was young.
【简答题】A．He has considered getting it. B．He thought it was interesting. C．He bought it already. D．He has finished reading it.
【单选题】如图所示,在半径为R 的无限长圆柱形空间内有一个均匀磁场,在某一时刻磁感应强度随时间的变化率为dB/dt 。在磁场中有 A 、 B 两点,其间可放置直导线 或弧形导线,则下列说法正确的是( )
A.
B.
C.
两导线上均有感生电动势，且两者感生电动势相等。
D.
两导线上均有感生电动势，且直导线上感生电动势小于弧形导线上的电动势。
【单选题】He is quite strange, for everything he does is opposite to ______ is considered normal behavior.
A.
whether
B.
that
C.
what
D.
which
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