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【简答题】
电磁波:随时间变化的运动电荷和电流辐射电磁场,电磁场在()互相激发,在空间以波动的形式存在。
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【单选题】Which of the following is true with regard to price?
A.
Historically, price has had the least perceptible impact on buyer choice.
B.
Price is the least flexible element in the marketing mix.
C.
Unike product features and channel commitments, prices cannot be changed quickly.
D.
Price is the sum of all the values that customers give up to gain the benefits of having a product.
【单选题】Which of the following is true with regard to price?
A.
Historically, price has had the least perceptible impact on buyer choice.
B.
Price is the least flexible element in the marketing mix.
C.
Unlike product features and channel commitments, prices cannot be changed quickly.
D.
Price is the sum of all the values that customers give up to gain the benefits of having a product.
E.
Prices only have an indirect impact on a firm's bottom line.
【单选题】两个完全相同的电容器 C 1 和 C 2 ,串联后与电源连接.现将一各向同性均匀电介质板插入 C 1 中,如图所示,则
A.
电容器组总电容减小．
B.
C 1 上的电荷大于 C 2 上的电荷．
C.
C 1 上的电压高于 C 2 上的电压 ．
D.
电容器组贮存的总能量增大．
【单选题】Which of the following is true with regard to price?
A.
Historically, price has had the least perceptible impact on buyer choice.
B.
Price is the least flexible element in the marketing mix.
C.
Unlike product features and channel commitments, prices cannot be changed quickly.
D.
Price is the sum of all the values that customers give up to gain the benefits of having a product.
【简答题】【图片】如图, 两个完全相同的电容器C1和C2，串联后与电源连接.现将一各向同性均匀电介质板插入C1中，则:_________(填入正确答案对应的字母，例如A)(A) 电容器组总电容减小.(B) C1上的电量大于C2上的电量.(C) C1上的电压高于C2上的电压.(D) 电容器组贮存的总能量增大.
【单选题】两个完全相同的电容器C1和C2，串联后与电源连接。现将一各向同性均匀电介质板插入C1中，如图所示，则【图片】
A.
电容器组总电容减小
B.
C 1 上的电荷大于 C 2 上的电荷
C.
C 1 上的电压高于 C 2 上的电压
D.
电容器组贮存的总能量增大
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