如图所示的电路中，滑动变阻器的滑片P从a滑向b的过程中，三只理

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问题不定项选择

如图所示的电路中，滑动变阻器的滑片P从a滑向b的过程中，三只理想电压表示数变化的绝对值分别为ΔU₁、ΔU₂、ΔU₃，下列各值可能出现的是

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A．△U₁＝3V　△U₂＝2V　△U₃＝1V

B．△U₁＝1V　△U₂＝3V　△U₃＝2V

C．△U₁＝0.5V　△U₂＝1V　△U₃＝1.5V

D．△U₁＝0.2V　△U₂＝1V　△U₃＝0.8V

答案

改错题

This is a story told by my father: “When I was boy, 1._______

the most exciting thing was when to celebrate the Spring 2. _______

Festival. My grandma was the best cooker in the world 3. _______

but could make the most delicious dishes. One time, I just 4. _______

couldn’t wait for the Spring Festival dinner. As I was 5. _______

about take a piece from a cooked duck, I saw Grandma in 6. _______

the kitchen looking at me. Shake her head, she said, ‘It 7. _______

isn't a good time to do that, dear. ’ At once I apologize 8. _______

controlled me at my best till the dinner started. You 9. _______

know, that was a dinner we had waited for several month. ” 10. _______

多项选择题

有爆炸危险的场所，其通风空调系统的风机应采用防爆型风机；当满足下列条件时可采用普通型风机：（）。

A、风机设置在单独的通风机房内

B、送风干管上设有止回阀

C、空气不应循环使用

D、采用耐火极限不低于2.0h的隔墙和1.5h的楼板和其它部位隔开

E、隔墙上开门时应采用乙级防火门