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【多选题】
关于逆变电路中能量传递,下列说法正确的是( )A.
电流从电源正极端流出者为输出功率，电流从电源正极端流入者为吸收功率
B.
两个电源同极性相连，电流总是从电动势高的电源流向电动势低的电源
C.
两电源反极性相连时，电动势数值相加，若回路电阻很小，则易形成短路，应避免出现此类情况。
D.
两个电源同极性相连，电流总是从电动势低的电源流向电动势高的电源
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【简答题】According to Mr. Heath and Mr. Potter, consumerism can be traced back to [A] the imposition of overbearing companies. [B] the very nature of arms race. [C] the ignorance of some stupid workers. [D] th...
【单选题】According to Mr. Heath and Mr. Potter, consumerism can be traced back to
A.
the imposition of overbearing companies.
B.
the very nature of arms race.
C.
the ignorance of some stupid workers.
D.
the desire to keep up with the Jones.
【单选题】According to the text the writer often talks in class about______.
A.
the arrangement of school parties
B.
the future of students'job choices
C.
the organization of school sports
D.
the planning of family vacations
【简答题】One day after school Mr. Tillman found Philo Farnsworth drawings on the blackboard in the school-room. “What are you doing?” Mr. Tillman asked with interest. “ What are these drawings?” “I want...
【简答题】According to Mr. Axelrod of Home Depot, people are trying to ride by ________________.
【单选题】When can Mr. Carson ring Mr. Prince according to the woman?
A.
He'll ring Mr. Prince as soon as he returns from lunch.
B.
He'll ring Mr. Prince as soon as he returns before lunch.
C.
He'll ring Mr. Prince as soon as he goes away from lunch.
【单选题】According to Mr. Green, this is a ( ) problem.
A.
grand
B.
complicated
C.
owing
D.
powder
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