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【判断题】
自感:当线圈中有电流通过时,线圈的周围就会产生磁场。当线圈中电流发生变化时,其周围的磁场也产生相应的变化,此变化的磁场可使线圈自身产生感应电动势(电动势用以表示有源元件理想电源的端电压),这就是自感。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Why many some areas become too dry for farming?
A.
Because there is too much over-planting.
B.
Because the growing season would be too short.
C.
Because heat would dry out the farmland.
D.
Because water is polluted
【单选题】In some areas of China, why will people eat lobster and chicken at wedding?
A.
they mean abundance.
B.
they mean bearing many children.
C.
they represent auspicious male-female pairing.
D.
they represent a long life.
【单选题】Section B Dialogue Comprehension Directions: In this section, you will read 5 short conversations between a man and a woman. At the end of each conversation there is a question followed by four choice...
A.
The man was confused about the date of the appointment.
B.
The man wants to change the date of the appointment.
C.
The man is glad he's got in touch with the. doctor.
D.
The man can't come for the appointment at 4:15.
【单选题】I can _____________ and I am _____________ now. [ ]
A.
sing, sing
B.
singing, sing
C.
sing, singing
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