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【简答题】
氢原子的基态 1s 电子在距核 53pm 附近的 中出现的 最大,是因为距核更近时, 虽大, 却较小,因而 较小,距核更远时, 虽较大, 却很小,因而 也较小。
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举一反三
【单选题】单位时间移动的距离是( ) 。
A.
速度
B.
加速度
C.
减速度
D.
梯度
【判断题】位移速度是指在单位时间内人体移动的距离。()
A.
正确
B.
错误
【简答题】阅读理解。 A Scotsman and an Englishman lived next door to each other. The Scotsman owned a hen and each morning he would look in his garden and pick up his hen’s egg for breakfast. One morning he looked i...
【单选题】The Scotsman employed by Edison( )
A.
designed a system to use the technology Edison had invented.
B.
used a available technology to make a new system,
C.
was already an expert in motion picture technology.
【简答题】When Scotsman Alexander Graham Bell invented the telephone in 1876, it was a revolution in communication.Over the last two decades a new means of spoken communication has emerged: the mobile phone. Th...
【简答题】阅读理解。 A Scotsman and an Englishman lived next door to each other. The Scotsman owned a hen and each morning he would look in his garden and pick up his hen's egg for breakfast. One morning he looked i...
【判断题】运动强度是决定运动量最主要的因素,是指单位时间移动的距离和速度,或肌肉单位时间内做的功,主要的指标有心率、最大摄氧量以及肌肉做功等。
A.
正确
B.
错误
【单选题】运动强度指的是单位时间内移动的距离或速度,或( )在单位时间内所做的功。
A.
人体
B.
肌肉
C.
上肢
D.
下肢
【判断题】运动强度是指单位时间移动的距离或速度,或肌肉单位时间所做的功。
A.
正确
B.
错误
【判断题】放学后要关闭门窗、水电气、盖好危险化学品。
A.
正确
B.
错误
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