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【单选题】
以下关于负载星形联接的三相电路说法错误的是:A.
负载 Y联结时，线电流等于相电流。
B.
负载对称时，中线电流为0，所以可省略中线。
C.
负载的相电压＝电源相电压，线电流＝相电流
D.
中线的作用：保证星形联结三相不对称负载的线电压对称。
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【单选题】A consumer’s behavior was observed in three situations with different prices and incomes. In situation 1, she chose a bundle that cost $1,600. In situation 2, she chose a bundle that cost $2,500. In s...
A.
1 must cost less than $3,100 at situation 3 prices
B.
3 must cost at least $3,100 at situation 1 prices
C.
1 can not cost less than $3,100 at situation 3 prices
D.
2 must cost at least $3,100 at situation 1 prices
【单选题】2Why did Mr. Layton call it a 'win-win' situation?
A.
The situation proved to be beneficial to both Mr. Edwin and the employer.
B.
The situation proved to be beneficial to Mr. Edwin, who with his talent and passion, would have better chances for career development.
C.
The situation proved to be beneficial to the employer who would sponsor a second employer.
D.
The situation proved to be beneficial to both the manufacturing company and speech coaches.
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