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【简答题】
当n＝4时，该电子层电子的最大容量为（）个；某元素原子在n＝4的电子层上只有2个电子，在次外层l＝2的轨道中有10个电子，该元素符号是（），位于周期表中第四周期，第（）族，其核外电子排布式为（）。
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【简答题】在汛期，水库、闸坝和其他水工程设施的运用，必须服从有关的防汛指挥机构的调度指挥和监督。 判断对错
【简答题】阅读理解。 Mr. and Mrs. White had two sons and three daughters. One Sunday, Mrs. White said to her husband, 'The children don't have any lessons today,and you are free too. There's a new funfair (游乐场) in t...
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【多选题】在汛期，水库、闸坝和其他水工程设施的运用，以下说法正确的是（）。
A.
必须服从有关的防汛指挥机构的调度指挥和监督
B.
在汛期，水库不得擅自在汛期限制水位以上蓄水
C.
其汛期限制水位以上的防洪库容的运用，必须服从防汛指挥机构的调度指挥和监督
D.
在凌汛期，有防凌汛任务的江河的上游水库的下泄水量必须征得有关的防汛指挥机构的同意，并接受其监督
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