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【单选题】
同时掷 3 枚均匀的硬币,恰好有两枚正面向上的概率为 【 】A.
0.125
B.
0.25
C.
0.325
D.
0.375
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【简答题】作用在同一刚体上的两个力,使刚体处于平衡的 条件是:这两个力的大小相等,方向相反,且作用在同一直线上。
【简答题】Two little children come to a new city. Their names are Peter and Tom. Certainly they live with their parents. Their family is very rich. They have a driver and a lot of servants (仆人). Peter and Tom a...
【单选题】Many children know little of the lives of relatives because _______.
A.
they have no time
B.
they are from the nucleus family
C.
they have never met them before
D.
they don't like them
【单选题】These animals are in danger. We should think ________ to protect them. [ ]
A.
what can we do
B.
what we can do
C.
how can we d o
D.
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