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【单选题】
正弦交流电的有效值为其最大值的（）。
A.
1.732倍
B.
1.414倍
C.
1/1.732倍
D.
0.707倍
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A.
根茎部
B.
秆部
C.
叶部
D.
穗部
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A.
降压变压器
B.
初次级绕组的绝缘程度高
C.
功率大
D.
容量小
E.
空载时次级电压应比负载时高
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【单选题】From paragraph 4, we can infer that
A.
if buying habits continue to favor sensationalism, papers will continue to misrepresent.
B.
the future of the media is one of truthfulness and accuracy.
C.
in order to lead to a positive direction, the media industry must be forced to change.
D.
a shift in public opinion will cause the media to change its habits in reporting.
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【单选题】具有中心点接地特点的是（）
A.
高压变压器
B.
自耦变压器
C.
灯丝变压器
D.
高压交换闸
E.
高压硅整流器
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【简答题】Translate the following into Chinese. 1. Many people agree that the increased enrollment is a big accomplishment. 2. The availability of certified accountants who can meet such high qualifications is ...
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【单选题】小麦全蚀病主要危害小麦植株的部位( )。
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B.
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C.
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