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A letter from hospital Hi Dave, I just wanted to say that l I’m in hospital again. I know you always say free running is dangerous. But this time I’m not alone. Dad is here with me in the next bed. He decided he was not too old to start free running but didn't realize how much training goes into getting fit Dad thought, "What Ann can do, I can do” and went into the park with me. Well, I thought I would start with easy jumps. Easy when you have been doing it for four years but not so easy when it is your first time. Anyway, Dad fell but managed to roll over and didn't hurt himself– too badly. Then I decided to jump from one low wall to the other, also not difficult, just a matter of timing. And this is where things went wrong for Dad. He fell as he was landing on the second wall and broke his right leg and right arm. Well, I didn't have my mobile phone with me so I had to run home to phone an ambulance. I didn't wait for the traffic lights to turn green and a car ran into me, breaking both my legs. Write soon. Love, Ann
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【判断题】为自由电子的能量
A.
正确
B.
错误
【单选题】胸壁组织增厚时常使胸部叩诊音变为
A.
过清音
B.
鼓音
C.
浊音
D.
实音
【单选题】要电子俘获过程中,高层电子向低能级跃迁时,能量全部转移给同一能级电子,接收到能量的电子脱离电子成为自由电子,叫做?
A.
正电子
B.
负电子
C.
俄歇电子
D.
自由电子
【简答题】一光子与自由电子碰撞,电子可能获得的最大能量为60keV,求入射光子的波长和能量。
【单选题】波长为662.6 pm的光子和自由电子,光子的能量与自由电子的动能比为
A.
10:3663
B.
273:1
C.
1:c
D.
546:1
【简答题】一光子与自由电子碰撞,电子可能获得的最大能量为60keV,求入射光子的波长和能量.
【单选题】波长为662.6pm的光子和自由电子,光子的能量与自由电子的动能比为( )。
A.
106:3663
B.
273:1
C.
1:c
D.
546:1
【简答题】三、 阅读《劝学 ) 选段回答各题, 积土成山,风雨兴焉;积水成渊,蛟龙生焉;积善成德,而神明自得,圣心备焉。故不积跬步,无以至千里;不积小流,无以成江海。骐骥一跃,不能十步;驽马十驾,功在不舍。锲而舍之,朽木不折;锲而不舍,金石可镂。蚓无爪牙之利,筋骨之强,上食埃土,下饮黄泉,用心一也。蟹六跪而二螯,非蛇鳝之穴无可寄托者,用心躁也。 1. 选出没有词类活用的一项是 ( ) 。 A. 用心一...
【单选题】波长为662.6pm的光子和自由电子,光子的能量与自由电子的动能比为何值?()
A.
1000000:3663
B.
273:1
C.
1:C
D.
546:1
【单选题】能量为 的自由电子的de Broglie波长是 [ ]
A.
1.2 ;
B.
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