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【简答题】
为什么用积分控制的调速系统是无静差的？在转速单闭环调速系统中，当积分调机器的输入偏差电压△U=0时，调节器的输出电压是多少？它决定于哪些因素？
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【单选题】听力原文：New York City: The United States National Weather Service says that the huge winter storm has dumped some 68.3 centimeters of snow in Central Park, making it the worst blizzard to hit New York Ci...
A.
Blizzard.
B.
Airplane crash.
C.
Heavy rain.
D.
Tsunami.
【简答题】试写出光吸收定律的数学表达式,并说明各符号的含义。
【单选题】This passage says that the work of removing stones______.
A.
is usually done during the winter
B.
was more difficult before machines were used
C.
must be done again and again
D.
is an interesting job children enjoy doing
【简答题】When did you last see a polar bear? On a trip to a zoo,perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These”Polar Bears” are p...
【简答题】补全单词。 ( ) 1. sc__ __f ( ) 2. wint__ __ ( ) 3. t__ __ch ( ) 4. spr__ __ __ ( ) 5. skat__ ( ) 6. w__ __d ( ) 7. mi__ __ens ( ) 8. less__ __ ( ) 9. sk__ ( ) 10. __...
【单选题】下列四个命题中真命题是（ ）
A.
同垂直于一直线的两条直线互相平行
B.
过空间任一点与两条异面直线都垂直的直线有且只有一条
C.
底面各边相等、侧面都是矩形的四棱柱是正四棱柱
D.
过球面上任意两点的大圆有且只有一个
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