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【单选题】
对于装备 1ZR 发动机的卡罗拉轿车,使用速度表检测台(标定用底盘测功机)检查速度表,速度表读数与容许范围之间的偏差最大不能超过 ( )km/h 。A.
、 0.5
B.
、 1
C.
、 1.5
D.
、 2
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【简答题】阅读理解 Tom, an 11-year-old boy, was ill. He had got a cough, and his mother was worried and took him to see a doctor. The doctor looked over Tom carefully and said, 'Tom, nothing serious.' Then he gave ...
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【多选题】关于受激辐射，下列说法正确的有：
A.
通过受激辐射产生的光子具有相同的状态
B.
粒子在两能级间跃迁发生受激辐射的速率与上能级的粒子数呈正比
C.
受激辐射与受激吸收是相反的物理过程
D.
普通光源里不存在受激辐射
E.
激光光源里不存在自发辐射，只存在受激辐射
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