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【简答题】
什么是对称三相电源?它们是怎么产生的?
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Membership fee:
【单选题】'Subscription' (Line 8, Para. ]) is
A.
the fee paid by the person with the membership of the Trust
B.
the donation by the citizens
C.
the money used to repair the ancient houses
D.
the support granted by the government
【单选题】All users of the website, including teachers and learners, must
A.
pay a membership fee.
B.
become registered users first.
C.
contribute their works.
D.
leave their contact information.
【简答题】谢谢。
【单选题】If a club calls for a membership fee, the freshers need to .
A.
be informed of it
B.
be pressurized into it
C.
look before they leap
D.
commit to a regular payment as soon as they know it
【单选题】The members club___12___ an annual membership fee of $30.
A.
pays
B.
mails
C.
charges
D.
costs
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