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【单选题】
对称三相电路三角形连接时,线电流比对应的相电流( )。A.
滞后30°
B.
滞后120°
C.
超前30°
D.
同相位
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举一反三
【单选题】What scientific creation has a greater impact on public opinion and policy?
A.
Computer models of Earth’s climate.
B.
The creation of fire
【简答题】近年来，我国某些地区出现了私自采黄金的现象。试回答下列问题： (1)提炼黄金的过程一般要使用化学药品氰化物，其直接后果是_______ ①污染水体 ②破坏臭氧层 ③危害工人的生命与健康 ④破坏植被 A．①② B．①②③ C．②④ D．①③④ (2)古代的“药金”外观与金相似，常被误认为金子。它的冶炼方法如下：将ZnCO 3 、赤铜(Cu 2 O)、木炭混合加热至800 ℃，得到金光闪闪的“...
【简答题】Writers and artists are always good______ of life for their creation, (observe)
【简答题】The case of ______ suggests that complacency and lack of creation will ruin a company.
【简答题】“The rhythmical creation of beauty” is definition of poetry made by Edgar Allen Poe in his essay ______________.
【单选题】Thrift institutions' participation in money creation is limited relative to ___.
A.
print works
B.
banks
C.
vaults
D.
factories
【单选题】______the beginning of the nineth century that the creation of more universities was seen to be either necessary or desirable.
A.
It was until
B.
It was not until
C.
Not it was
D.
It was from
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