【单选题】【消耗次数:1】
__________ that silver is not widely used as a conductor?
Why is
Is it why
Why is it
Why is that
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相关题目
【单选题】 __________ that silver is not widely used as a conductor?
①  Why is
②  Is it why
③  Why is it
④  Why is that
【单选题】 Why not [填空] again?
①  try
②  tried
③  tries
④  trying
【单选题】 Why not join us in baseball?____________
①  Ok. I’m coming.
②  You do the same.
③  Don’t mention it.
④  That’s alright.
【单选题】 The reason why the car was stopped was ____.
①  that the road was slippery
②  due to the slippery road
③  because the road was slippery
④  because of the slippery road
【单选题】 Why [填空]you have a try?
①  dont
②  not
③  no
④  doesnt
【单选题】 Why not go and have dinner in a restaurant? ____________ It’s too expensive.
①  Why not?
②  I agree.
③  I am afraid not.
④  I’m sure.
【单选题】 Why he did it will remain a ____for ever.
①  strange
②  pass
③  public
④  puzzle
【判断题】 A: Why not try it on? B: Thats OK.
①  正确
②  错误
【多选题】 ------ Why did she visit Africa?------ She went there____________________ .
①  for research work
②  to do research
③  to gather information
④  to collect information
【单选题】 Why don’t you travel to New York on vacation?
①  I don’t want to go
②  Excuse me, because I can’t
③  I want to, but I haven’t got enough money
④  Because I’m going to school today
随机题目
【判断题】 变压器接交流电源,空载时也会有损耗,这种损耗的大部分是磁滞损耗。
①  正确
②  错误
【判断题】 三相变压器理想并联运行的条件是:⑴变压比相同;⑵联接组标号相同;⑶?短路电压相等且短路电阻同短路电抗比值相等。
①  正确
②  错误
【判断题】 交流同步发电机转子的转速n与定子旋转磁场的转数n。的关系是nn0。
①  正确
②  错误
【判断题】 当变压器工作时,带额定负载运行?情况下其效率最高。
①  正确
②  错误
【判断题】 电流互感器在使用时,原绕组与负载串联。
①  正确
②  错误
【判断题】 一台并网运行的同步发电机,按发电机惯例,已知原运行点的功率因数是超前的,?则电机运行在欠励状态,此时电机从电网吸收感性性质的无功功率。
①  正确
②  错误
【判断题】 在电力系统中,三相变压器组一般不采用Yy联结,这是因为相电势波形严重畸变,危及绕组绝缘。
①  正确
②  错误
【判断题】 同步补偿机就是运行于空载、欠励状态下的同步电动机。
①  正确
②  错误
【判断题】 交流电机一般采用短距、分布绕组的原因是为了改善电势的波形及磁势的波形。
①  正确
②  错误
【判断题】 变压器之所以能够变压是因为原副边绕组匝数不等。
①  正确
②  错误