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【单选题】
在三相四线制供电电路中,中性线的作用是 ( ) 。A.
在负载不对称时，保证相电压对称
B.
构成电流的回路
C.
使电源线电压对称
D.
使相电流对称
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反馈参考答案：
举一反三
【判断题】采用同一系列的颜色来搭配服装重在显现和谐美。具体应用时要注意,同系色之间也要有等距离的深浅之分,要掌握好其分寸感,色彩过于相近,则层次不够分明;色彩相差太远,则有失协调。
A.
正确
B.
错误
【单选题】The bear pulled out his tail when ______.
A.
he felt a big fish touching his tail
B.
he felt he could not put up with the cold
C.
he thought he had enough fish for his supper
D.
he saw the fox run far away from him
【单选题】than he felt at first. He felt【C8】______light that he could not
A.
very
B.
so
C.
as
D.
too
【简答题】选择题、在下列各种情况下,应分别采用哪种类型(低通、高通、带通、带阻)的滤波电路。 (1)抑制50Hz交流电源的干扰; (2)处理具有1Hz固定频率的有用信号; (3)从输入信号中取出低于2kHz的信号; (4)抑制频率为100kHz以上的高频干扰。
【简答题】Unlike traditional lightin9，LEDs do not give out heat So___________．
【单选题】请根据短文的内容，回答题。 Weaving with Light In the Sierra Madre mountain range of west central Mexico, the native Huichol people live much the way their ancestors did--without electricity. That&39;s because it&3...
A.
it is too difficult for them to change their lifestyle
B.
they know nothing about it
C.
it costs too much to string power lines
D.
they don't need it
【单选题】( ) Is a self-supporting cross-border e-commerce platform.
A.
LightIn TheBox
B.
DHgate
C.
Amazon
D.
eBay
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