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【单选题】
下列关于影响液体电介质击穿电压的因素,描述正确的是( )A.
不均匀电场中杂质对击穿电压的影响小
B.
温度越高,击穿电压越高
C.
电压作用越长,液体电介质的击穿电压越高
D.
液体的压力越大,击穿电压越低
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【单选题】By the time Mr. Saint Laurent set up shop in Paris under his own name, he had always worked as a (n)
A.
showman.
B.
artist.
C.
painter.
D.
designer.
【单选题】When Mr. Smith took over the company, it was already heavily______ and had no money to pay the workers.
A.
in danger
B.
in relief
C.
in debt
D.
in return
【单选题】水平角测量时，角值β =b-a。现知读数a为82°33′24″，读数b为102°42′12″，则角值β是【 】
A.
20°18′46″
B.
20°08′48″
C.
20°42′24″
D.
20°38′12″
【简答题】Mr. Lang worked in a factory. As a driver, he was busy. Sometimes, he brought some materials to the factory, and most of the time, he had to carry the goods to the customers of the factory. It was not...
【单选题】—You seem familiar with Mr. John? —Sure, we ______ together for three years in the 1990s.
A.
have worked
B.
had worked
C.
are working
D.
worked
【单选题】By the time Mr. Saint Laurent set up shop in Paris under his own name, be had always worked as a(n)
A.
showman.
B.
artist.
C.
painter.
D.
designer.
【单选题】水平角测量时，角值β＝b－a。现已知读数a为182°33′24″，读数b为102°42′12″，则角值β是（ ）
A.
79°51′12″
B.
－280°08′48″
C.
280°08′48″
D.
－79°51′12″
【简答题】在零件图上,标注Φ6H7,表示要进行 ,钻底孔 。
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