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【单选题】
关于变化电磁场与稳恒电磁场A.
电荷和电流激发
B.
都具有能量
C.
都不可脱离场源而单独存在
D.
都是无界的
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反馈参考答案：
举一反三
【单选题】下列命题中的假命题是（ ）
A.
?x∈R，x 2 ≥0
B.
?x∈R，lgx≥0
C.
若实数x、y，则|x|≠|y|?x≠y且x≠-y
D.
命题“若a 2 +b 2 =0，则a、b全为0”的否定为“若a 2 +b 2 =0，则a、b全不为0”
【单选题】Before going for an interview it is important to ___________ as much information as possible about the company.
A.
look after
B.
look on
C.
look out
D.
look up
【单选题】单相桥式整流电容滤波电路如图6-20所示,已知交流电源频率f=50Hz,u2的有效值U2=15V, RL=50Ω，则滤波电容C容量的大小为：
A.
1000μF
B.
2200μF
C.
3300μF
D.
100μF
【简答题】This is the time of year when people start scheduling their annual checkups. It's advisable for you to do certain things before going for an annual checkup such as lists of medical complaints a...
【单选题】下列命题是假命题的是（ ）
A.
对于两个非零向量 a 、 b ，若存在一个实数k满足 a =k b ，则 a 与 b 共线
B.
若 a = b ，则 | a |=| b |
C.
若 a 、 b 为两个非零向量，则 | a + b |＞| a - b |
D.
若 a 、 b 为两个方向相同的向量，则 | a + b |=| a |+| b |
【简答题】According to the author, what do people need to do before going for an interview?
【单选题】Before going for arbitration, both parties involved in a dispute need to make an arbitration agreement in written form, in which they agree to refer the subject in dispute to a third party. This indic...
A.
flexible
B.
necessary
C.
compulsory
D.
firm
【单选题】Before going for arbitration,both parties involved in a dispute need to make an arbitration agreement in written form,in which they agree to refer the subject in dispute to a third party.This indicate...
A.
flexible
B.
simplified
C.
compulsory
D.
voluntary
【简答题】It is extremely important for a job applicant to___ ____ ________ before going on an interview.
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