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【简答题】

有一种新式楼梯灯，当有人走近时，它就会变亮，当人离开时它就会熄灭，请你猜想一下新式楼梯灯的原理是什么？

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题目标签：变亮猜想楼梯灯
参考答案：
参考解析：
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刷刷题刷刷变学霸
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【判断题】遭遇拥挤的人流时,一定不要采用体位前倾或者低重心的姿势,即便鞋子被踩掉,也不要贸然弯腰提鞋或系鞋带。在晚上上下楼梯时,不要关闭楼梯灯。
A.
正确
B.
错误
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A.
unless
B.
however
C.
although
D.
even if
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【简答题】设0＜θ＜ ，已知 ， ,猜想 ＝________．
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【简答题】由1+3=22，1+3+5=32，1+3+5+7=42，猜想1+3+5+7+…+（2n+1）=______．
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【单选题】How much sleep does a person need?【B1】the physiological bases of the need for sleep remain conjectural(猜想), rendering conclusive answers to this question impossible, much evidence has been gathered on...
A.
As
B.
Despite
C.
While
D.
Whether
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【单选题】How much sleep does a person need (31) the physiological bases of the need for sleep remain conjectural (猜想), rendering conclusive answers to this question impossible, much evidence has been gathered...
A.
extend
B.
range
C.
alter
D.
rise
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【单选题】当1，2，3，4，5，6时，比较和的大小并猜想（）
A.
时，
B.
时，
C.
时，
D.
时，
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A.
正确
B.
错误
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【单选题】How much sleep does a person need (31) the physiological bases of the need for sleep remain conjectural (猜想), rendering conclusive answers to this question impossible, much evidence has been gathere...
A.
brief
B.
precise
C.
correct
D.
concise
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【简答题】绘图题：用开关K1、K2、K3控制一个楼梯灯D，当有2个或3个开关合上时，D亮，否则D不亮，试写出其逻辑表达式并画出其继电器电路图。
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