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You can’t always predict a heavy rain or remember your umbrella. But designer Mikhail Belvacv doesn’t think that forgetting to check the weather report before heading out should result in you getting wet. To protect people from the rain, he created lampbrella, a lamp post with its own rain sensing umbrella. The designer says he comes up with the idea after watching people get wet on streets in Russia. “Once, I was driving on a central Saint Petersburg street and saw the street lamps lighting up people trying to hide from the rain. I thought it would be all right to have a canopy(伞蓬)built into a street lamp.” he said. The lampbrella is a street lamp fitted with an umbrella canopy. It has a built-in electric motor which can open or close the umbrella in need. Sensors(传感器)then make sure that the umbrella offers the walkers whenever it starts raining. In addition to the rain sensor, there’s also a 360° motion sensor on the street lamp which finds out whether anyone’s using the lampbrella. After three minutes of not being used the canopy is closed. According to the designer, the lampbrella would move at a low speed, so as not to cause harm to the walkers. Besides, it would be grounded to protect from possible lightning strike. Each lampbrella would offer enough protection for several people. Being fixed at 2 meters off the ground, it would only be a danger for the tallest of walkers. While there are no plans to take lampbrella into production, Belyacv says he recently introduced his creation to one Moscow Department, and insists this creation could be fixed on my street where a lot of people walk. 小题1:Who designed lampbrella? 小题2:Why did Belyacv create lampbrella? 小题3:How soon is the the canopy closed if it’s not being used? 小题4:Would each lampbrella offer enough protection for only one person or several people? 小题5:What is the main idea of the passage?
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【简答题】半径为a=1mm的长直圆柱导线通恒定电流I=1A。外面包一层厚度为b=1mm的绝缘材料,磁导率为m=2m0,绝缘层内表面(半径为a处)中的极化强度M大小为 ( )【保留小数点后两位】
【多选题】主张自由贸易的学者有
A.
亚当·斯密
B.
凯恩斯
C.
大卫·李嘉图
D.
俄林
【单选题】根据是否患有其他慢性病,如糖尿病、高血压、冠心病等,将肥胖分为单纯性肥胖和()。
A.
复杂性肥
B.
轻微肥胖
C.
重症肥胖
D.
中度肥胖
【多选题】根据是否患有其他慢性病,如糖尿病、高血压、冠心病等,将肥胖分为
A.
单纯性肥胖
B.
复杂性肥群
C.
重症肥胖
D.
中度肥胖
E.
轻微肥胖
【单选题】根据是否患有其他慢性病,如糖尿病、高血压、冠心病等,将肥胖分为单纯性肥胖和重症肥胖。单纯性肥胖者占肥胖症总人数的()。
A.
80%以上
B.
85%以上
C.
90%以上
D.
95%以上
【简答题】绝缘电线的内部为半径为R,长度为L的铜线,该铜线的导热系数λ 1 为常数,电阻率为α(Ω·m 2 /m),导线通过电流I(A)而均匀发热。铜线外侧敷设绝缘塑料皮,绝缘塑料皮厚度为δ,其导热系数λ 2 为常数,已知铜线外侧与绝缘塑料皮接触处温度恒定为t w ,绝缘塑料皮的外侧空气温度为t f ,绝缘塑料皮外侧与空气间的表面传热系数为h。试写出这一稳态过程的数学描述。 [分析]本题考察重点为圆柱形物体...
【单选题】根据是否患有其他慢性病,如糖尿病、高血压、冠心病等,将肥胖分为单纯性肥胖和( ):
A.
复杂性肥胖
B.
轻微肥胖
C.
重症肥胖
D.
中度肥胖
【多选题】根据是否患有其他慢性病,如糖尿病、高血压、冠心病等,将肥胖分为()。
A.
单纯性肥胖(√)
B.
复杂性肥胖
C.
重症肥胖(√)
D.
中度肥胖
E.
轻微肥胖
【单选题】根据是否患有其他慢性病,如糖尿病、高血压、冠心病等,将肥胖分为单纯性肥胖和重症肥胖。单纯肥胖者占肥胖症总人数的()。
A.
复杂性肥
B.
轻微肥胖
C.
重度肥胖(√)
D.
中度肥胖
【单选题】发动机冷却剂应该( )换一次。
A.
每年
B.
每两年
C.
每三年
D.
每五年
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