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【简答题】
对称三相负载作 Y 接,接在 380V 的三相四线制电源上。此时负载端的相电流等于( )倍的线电流,中线电流等于( )。
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【单选题】When the teacher came into the classroom, all of us __________ the classroom.
A.
are cleaning
B.
were cleaning
C.
cleaned D are cleaned
【单选题】听力原文： World Environment Day was established by the United Nations General Assembly in 1972 to mark the opening of the Stockholm Conference on the Human Environment. World Environment Day can be celebr...
A.
In 1992.
B.
In 2000.
C.
In 2004.
D.
In 1972.
【单选题】There isn’t a teacher in the classroom and all the students are talking. So the classroom is ________.
A.
quiet
B.
strict
C.
noisy
【单选题】Their classroom is _____ than ours, that is to say, their classroom is as small as ours.
A.
much bigger
B.
much smaller
C.
no bigger
D.
less small
【单选题】According to the speaker Liu Yuhan, which one does she prefer, the traditional classroom or the online classroom?
A.
traditional classroom
B.
online classroom
【单选题】听力原文： (32)World Environment Day was established by the United Nations General Assembly in 1972 to mark the opening of the Stockholm Conference on the Human Environment. (33)World Environment Day can b...
A.
In 1992.
B.
In 2000.
C.
In 2004.
D.
In 1972.
【单选题】听力原文： World Environment Day was established by the United Nations General Assembly in 1972 to mark the opening of the Stockholm Conference on the Human Environment. World Environment Day can be celebr...
A.
In 1992.
B.
In 2000.
C.
In 2004.
D.
In 1972.
【单选题】听力原文：M: Good evening and welcome to our program. Our guest is Mrs. Green, who is an expert in the field of environ mental protection. Welcome to our program, Mrs. Green. W: Thank you. M: Well, we hear...
A.
Keys to paper recycling.
B.
Importance of recycling.
C.
Keys to recycling improvement.
D.
Technological progress in recycling.
【单选题】听力原文： We hear it a lot in the news these days: 'Recycle newspapers and save a tree. Collect bottles and calls so they can be reused in the manufacturing of new products.' Protecting our delicate envir...
A.
Important Keys to Recycling Paper.
B.
Technological Advances Improve Recycling.
C.
Steps to Improve Recycling.
D.
A Greater Demand for Improving Recycling.
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