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【简答题】
下列说法正确的是(    )． A．闭合回路上各点磁感强度都为零时，回路内一定没有电流穿过 B．闭合回路上各点磁感强度都为零时，回路内穿过电流的代数和必定为零 C．磁感强度沿闭合回路的积分为零时，回路上各点的磁感强度必定为零 D．磁感强度沿闭合回路的积分不为零时，回路上任意  点的磁感强度都不可能为零
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【单选题】For an F distribution, the number of degrees of freedom for the numerator
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【单选题】The initial document that formally recognizes the existence of a project is the _____ .
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【简答题】A．For the sake of safety. B．For the service of a girl. C．For the need of a soldier. D．For proper load balance.
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A.
must be larger than the number of degrees for the denominator
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