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【单选题】
两个极性不同的条形磁铁相互靠近时,它们会( )。A.
相互排斥
B.
相互吸引
C.
互不理睬
D.
有时吸引、有时排斥
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【简答题】A．He was housed by Emma Thompson five years ago. B．He has graduated from an England university. C．He has become a British citizen. D．He will be 15 years old in April.
【简答题】已知电路如图所示，R 1 =10Ω，R 2 =40Ω，R L =10Ω，L 1 =5H，L 2 =1H，M=0.5H， ，ω=100rad/s，试求 和 。
【单选题】(Even though) Sedat (has been studying) English for three years before he came (to the United States), It is still difficult for him (to express himself).
A.
Even though
B.
has been studying
C.
to the United States
D.
to express himself
【简答题】已知电路如图a所示，U S =48V，R 1 =2Ω，R 2 =R 4 =3Ω，R 3 =6Ω，R L =5Ω，试用戴维南定理求解I O 。
【简答题】根据短文后所给的任务，完成小题. Now the idea of “car sharing” has become popular in Europe and the United States. That’s to say, people share（分享） one car, not each person has one . (65) As we know, most cars are par...
【单选题】第三年订货会上，企业获得一张交货期为4Q，总价300W，数量6个P1的订单。现在处于第三年第四季度，企业由于原料采购失误，没有足够的原材料生产P1，此时企业库存5个P1，那么企业最优的选择是哪个方案？
A.
支付违约金
B.
紧急采购1个P1交货
C.
紧急采购一个R1进行生产
D.
拍卖5个P1
【简答题】已知电路如图a所示，R 1 =1Ω，R 2 =2Ω，R 3 =3Ω，R 4 =4Ω，R L =5Ω，U S =15V，试用戴维南定理求电阻R中的电流I。
【简答题】电路如图所示。已知 RL= 5Ω,试求电路中的电流 I 。
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