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【简答题】
(题干)物质由原子组成,每个原子均由原子核及电子组成,电子由于受原子核的吸引力沿一定的轨道绕核旋转。核外的电子因距离核远近不同而具有不同的壳层。每个可能轨道上的电子都具有一定的能量,且电子在各个轨道上具有的能量是不连续的。原子核对电子的吸引力是A.结合力 B.激发能 C.电离能 D.跃迁力 E.基态能 表征原子的能量状态的称为A.原子能级 B.轨道半径 C.结合能 D.电离能 E.激发能 移走原子中某壳层轨道电子所需要的最小能量是A.结合能 B.激发能 C.电离能 D.跃迁 E.高能级 原子处于最低能量状态称为A.基态 B.激发态 C.第一激发态 D.第二激发态 E.跃迁 同一原子中,电子结合能最大的壳层是A.L壳层 B.N壳层 C.K壳层 D.O壳层 E.M壳层
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【单选题】一般开挖深度超过()的基坑称为深基坑
A.
5m
B.
6m
C.
7m
D.
8m
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250%
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67%
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150%
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40%
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