【判断题】【消耗次数：1】
导线运动方向与导线本身垂直，而与磁感线方向成 角时，导线切割磁感线产生的感应电动势的大小为E=Blvsinθ。
①
正确
②
错误
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相关题目
【单选题】
磁感线也叫“磁力线”它具有的性质不包括（ ）。
①
磁感线是互不相交的闭合曲线，在磁体外部由N极指向S极，在磁体内部由S极指向N极。
②
磁感线的疏密程度反映了磁场的强弱。
③
磁感线上每一点的切线方向就是该点的磁场方向。
④
以上都正确
【多选题】
施工现场架空线，关于导线与地面最小垂直距离说法正确的是（ ）。
①
施工现场应不小于4m
②
机动车道应不小于5m
③
机动车道应不小于6m
④
铁路轨道应不小于7m
⑤
铁路轨道应不小于7.5m
随机题目
【单选题】
Cleaning women in big cities usually get ＿＿＿＿＿＿ by the hour.
①
paying
②
pay
③
paid
④
to pay
【单选题】
He the job well，but he so careless.
①
could do，was
②
had done，had been
③
could have done，was
④
hadnˊt done，had been
【单选题】
I to stay there for one more week，but I changed my mind.
①
was hoping
②
had hoped
③
Hoped
④
would have hoped
【单选题】
＿＿＿ your letter，I would have started off two days ago.
①
If I could have received
②
Should I receive
③
Had I received
④
If I received
【单选题】
If I with her last summer，I with her now.
①
worked…am getting on very well
②
had worked…would get on very well
③
had worked… would have got on very well
④
had worked…will get on very well
【单选题】
I was very busy yesterday, otherwise I to the meeting.
①
had come
②
would have come
③
would come
④
came
【单选题】
If it rain next week，the farmers could still have a good harvest.
①
should
②
could
③
would
④
might
【单选题】
If you hadn’t gone with Tom to the party last night, ＿＿＿＿＿＿.
①
you would meet John already
②
you would have met John
③
you won’t have missed John
④
you will have met John