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【多选题】
不确定度关系的论述哪些是正确的?A.
是不确定原理的数学形式
B.
是一种判据
C.
可归结为普朗克常量是否为零？
D.
判断体系的运动问题可否应用经典力学来研究
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【简答题】I’m afraid you’ve missed the d____, because the teacher asked us to hand in the report before March 30th.
【单选题】关于照明正确的说法是
A.
光通量是指从光源每秒发出的可见光辐射能流
B.
光强是指单位面积在某一方向上射向眼睛的光亮大小的数值
C.
照度是指当一个物体表面收到均匀照射时，单位面积上的采光均匀度
D.
光亮度是指全部利用天然光进行采光时的室外最低照度
E.
采光均匀度是指在假定工作面上采光系数的最高值与平均值之比
【简答题】根据句意及首字母提示补全单词 1. The teacher asked the two students to make a short d about shopping. 2. We learned some poems written by Li Bai yesterday. Our teacher asked us to r them. 3. The little girl was fr...
【简答题】A On the first day of the 11th grade, our new math teacher Mr Washington asked me to go to the blackboard to do a math problem. I told him that I couldn’t do it. He asked, “Why not?” I paused, and the...
【单选题】What do scientists think causes dreams?
A.
Sleep.
B.
Scientists have not found the reason up to now.
C.
REM sleep.
D.
It is not mentioned in the article, but scientists have known it.
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