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【简答题】
如图,一光滑水平桌面紧靠在墙边,桌上放置一质量为m=1kg的小球,开始小球通过细线连接在墙上,细线穿过弹簧,调整细线的长度,使开始时弹簧处于压缩状态,弹簧弹性势能E P =4.5J。某时刻烧断细线,小球开始运动并飞离桌面进入右侧曲线轨道(为圆轨道的一部分)。已知小球进入圆轨道时其速度方向恰好沿着B点处的切线方向。若小球恰能运动至轨道的最高点C点,求此轨道的半径R。(已知重力加速度g=10m/s 2 ,图中 θ =53 ° )
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【单选题】Depression is very common in modern society. ________ 1 in every 33 children may have depression; in teens, that number may be ________ 1 in 8.
A.
As little as; as low as
B.
As many as; as much as
C.
As many as; as high as
D.
As few as; as low as
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【单选题】从UE侧来看，切换流程是从下面哪条信令开始的?()
A.
MeasurementControl
B.
MeasurementReport
C.
HandoverRequest
D.
HandoverCommand
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