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【简答题】
三相半波可控整流电路纯电阻负载,电源电压 U 2 = 200V, 电阻为 10 Ω。 画出α=90° 时,三相电源相电压、三相电源相电流、整流输出电压、整流输出电流、a相晶闸管端电压波形图。(可手工绘制,拍照上传;须标注刻度,美观准确)
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举一反三
【简答题】读图，完成下列各题。 小题1:图所示景观中，主要由风力侵蚀作用形成的是 A．① B．② C．③ D．④ 小题2:形成图中②图所示千沟万壑地貌景观的主要的外力作用是 A．流水溶蚀 B．流水侵蚀 C．风力堆积 D．流水堆积
【单选题】被马克思评价为 “ 重商主义的福音书 ” 的是英国晚期重商主义代表人物托马斯 × 曼的
A.
《关于英国公共福利的谈话》
B.
《献给国王和王太后的政治经济学》
C.
《论英国和东印度的贸易》
D.
《对近来我国各界同胞的一些抱怨的简单考察》
【单选题】The passage suggests that AACSB International______.
A.
started the debate concerned in the 1950s
B.
requires that business schools stop listing journal citations
C.
judges the quality of research in business schools
D.
used to evaluate research by its usefulness for business practice
【多选题】Chinese students overseas debate returning home amid pandemic 2020/3/23 13:01:44 source: CGTN Since March, the situation of COVID-19 has gradually improved in China, but many countries around the wo...
A.
It’s hard to buy airline ticket. And even if they have bought them, the flight might be canceled.
B.
They might confront cross-infection risks during the international flight.
C.
Some Chinese local people don’t want them to be back home, in case that they are going to worsen the situation in China.
D.
Some Chinese students overseas don’t like to add an extra burden to Chinese local medical efforts or add to China’s challenges, so they would rather stay.
E.
If they go back China, they might not easily go back to the host country to continue their studies.
【简答题】读图，完成1—2题。 1、上图所示景观中，主要由风力侵蚀作用形成的是 [ ] A．① B．② C．③ D．④ 2、形成上图中②图所示千沟万壑地貌景观的主要的外力作用是 [ ] A．流水溶蚀 B．流水侵蚀 C．风力堆积 D．流水堆积
【单选题】The two professors started a lively debate about whether intellectuals should go into business.
A.
intensive
B.
fruitless
C.
amusing
D.
heated
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